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Available in 28 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-28" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">28 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Asterisk" title="Asterisk – Catalan" lang="ca" hreflang="ca" data-title="Asterisk" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Asterisk" title="Asterisk – Czech" lang="cs" hreflang="cs" data-title="Asterisk" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Asterisk_(Telefonanlage)" title="Asterisk (Telefonanlage) – German" lang="de" hreflang="de" data-title="Asterisk (Telefonanlage)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Asterisk" title="Asterisk – Spanish" lang="es" hreflang="es" data-title="Asterisk" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Asterisk" title="Asterisk – Basque" lang="eu" hreflang="eu" data-title="Asterisk" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D8%B3%D8%AA%D8%B1%DB%8C%D8%B3%DA%A9_(%D9%BE%DB%8C%E2%80%8C%D8%A8%DB%8C%E2%80%8C%D8%A7%DA%A9%D8%B3)" title="استریسک (پی‌بی‌اکس) – Persian" lang="fa" hreflang="fa" data-title="استریسک (پی‌بی‌اکس)" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Asterisk_(logiciel)" title="Asterisk (logiciel) – French" lang="fr" hreflang="fr" data-title="Asterisk (logiciel)" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Asterisk" title="Asterisk – Galician" lang="gl" hreflang="gl" data-title="Asterisk" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%95%84%EC%8A%A4%ED%85%8C%EB%A6%AC%EC%8A%A4%ED%81%AC_(PBX)" title="아스테리스크 (PBX) – Korean" lang="ko" hreflang="ko" data-title="아스테리스크 (PBX)" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D5%BD%D5%BF%D5%A5%D6%80%D5%AB%D5%BD%D5%AF_(%D4%B1%D5%80%D4%BF)" title="Աստերիսկ (ԱՀԿ) – Armenian" lang="hy" hreflang="hy" data-title="Աստերիսկ (ԱՀԿ)" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Asterisk_PBX" title="Asterisk PBX – Indonesian" lang="id" hreflang="id" data-title="Asterisk PBX" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Asterisk_PBX" title="Asterisk PBX – Italian" lang="it" hreflang="it" data-title="Asterisk PBX" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%A1%D7%98%D7%A8%D7%99%D7%A1%D7%A7" title="אסטריסק – Hebrew" lang="he" hreflang="he" data-title="אסטריסק" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Asterisk" title="Asterisk – Latvian" lang="lv" hreflang="lv" data-title="Asterisk" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%86%E0%B4%B8%E0%B5%8D%E0%B4%B1%E0%B5%8D%E0%B4%B1%E0%B4%B1%E0%B4%BF%E0%B4%B8%E0%B5%8D%E0%B4%95%E0%B5%8D%E0%B4%95%E0%B5%8D_%E0%B4%AA%E0%B4%BF.%E0%B4%AC%E0%B4%BF.%E0%B4%8E%E0%B4%95%E0%B5%8D%E0%B4%B8%E0%B5%8D" title="ആസ്റ്ററിസ്ക്ക് പി.ബി.എക്സ് – Malayalam" lang="ml" hreflang="ml" data-title="ആസ്റ്ററിസ്ക്ക് പി.ബി.എക്സ്" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%80%E1%80%BA%E1%80%85%E1%80%91%E1%80%9B%E1%80%85%E1%80%BA" title="အက်စထရစ် – Burmese" lang="my" hreflang="my" data-title="အက်စထရစ်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Asterisk_PBX" title="Asterisk PBX – Dutch" lang="nl" hreflang="nl" data-title="Asterisk PBX" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Asterisk_(PBX)" title="Asterisk (PBX) – Japanese" lang="ja" hreflang="ja" data-title="Asterisk (PBX)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Asterisk" title="Asterisk – Polish" lang="pl" hreflang="pl" data-title="Asterisk" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Asterisk" title="Asterisk – Portuguese" lang="pt" hreflang="pt" data-title="Asterisk" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Asterisk" title="Asterisk – Romanian" lang="ro" hreflang="ro" data-title="Asterisk" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Asterisk" title="Asterisk – Russian" lang="ru" hreflang="ru" data-title="Asterisk" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Asterisk_PBX" title="Asterisk PBX – Albanian" lang="sq" hreflang="sq" data-title="Asterisk PBX" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Asterisk_PBX" title="Asterisk PBX – Serbian" lang="sr" hreflang="sr" data-title="Asterisk PBX" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Asterisk_(telefonv%C3%A4xel)" title="Asterisk (telefonväxel) – Swedish" lang="sv" hreflang="sv" data-title="Asterisk (telefonväxel)" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Asterisk" title="Asterisk – Ukrainian" lang="uk" hreflang="uk" data-title="Asterisk" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Asterisk_(PBX)" title="Asterisk (PBX) – Vietnamese" lang="vi" hreflang="vi" data-title="Asterisk (PBX)" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh 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id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">PBX software</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For other uses, see <a href="/wiki/Asterisk_(disambiguation)" class="mw-disambig" title="Asterisk (disambiguation)">Asterisk (disambiguation)</a> and <a href="/wiki/*_(disambiguation)" class="mw-disambig" title="* (disambiguation)">* (disambiguation)</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">Asterisk</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Asterisk_logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/20/Asterisk_logo.svg/250px-Asterisk_logo.svg.png" decoding="async" width="220" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/20/Asterisk_logo.svg/330px-Asterisk_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/20/Asterisk_logo.svg/500px-Asterisk_logo.svg.png 2x" data-file-width="650" data-file-height="383" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data"><a href="/wiki/Sangoma_Technologies_Corporation" title="Sangoma Technologies Corporation">Sangoma Technologies Corporation</a></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546" /></td></tr><tr><th colspan="2" class="infobox-header"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Stable release(s)</a> <span class="plainlinks" style="font-size:smaller; margin:0px"><a class="external text" href="https://en.wikipedia.org/wiki/Template:Latest_stable_software_release/Asterisk?action=edit">[±]</a></span></th></tr><tr><td colspan="2" class="infobox-full-data">21.3.1 (17 May 2024<span class="noprint">; 10 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2024-05-17</span>)</span><sup id="cite_ref-asterisk-21-series_1-0" class="reference"><a href="#cite_note-asterisk-21-series-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>)<br /> <p>20.5.0 LTS (18 October 2023<span class="noprint">; 17 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2023-10-18</span>)</span><sup id="cite_ref-asterisk-20-series_2-0" class="reference"><a href="#cite_note-asterisk-20-series-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>)<br /> 19.8.1 (7 July 2023<span class="noprint">; 20 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2023-07-07</span>)</span><sup id="cite_ref-asterisk-19-series_3-0" class="reference"><a href="#cite_note-asterisk-19-series-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>)<br /> </p> 18.20.0 LTS (18 October 2023<span class="noprint">; 17 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2023-10-18</span>)</span><sup id="cite_ref-asterisk-18-series_4-0" class="reference"><a href="#cite_note-asterisk-18-series-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>)</td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546" /></tr><tr><th colspan="2" class="infobox-header"><a href="/wiki/Software_release_life_cycle#Beta" title="Software release life cycle">Preview release(s)</a> <span class="plainlinks" style="font-size:smaller; margin:0px"><a class="external text" href="https://en.wikipedia.org/wiki/Template:Latest_preview_software_release/Asterisk?action=edit">[±]</a></span></th></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><span class="url"><a rel="nofollow" class="external text" href="https://github.com/asterisk/asterisk">github<wbr />.com<wbr />/asterisk<wbr />/asterisk</a></span> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q622754#P1324" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></li></ul> </div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/C_(programming_language)" title="C (programming language)">C</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Voice_over_Internet_Protocol" class="mw-redirect" title="Voice over Internet Protocol">Voice over Internet Protocol</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GPLv2</a> with additional licenses available from Digium<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://www.asterisk.org/">www<wbr />.asterisk<wbr />.org</a></span> <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q622754?uselang=en#P856" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr></tbody></table> <p><b>Asterisk</b> is a <a href="/wiki/Software" title="Software">software</a> implementation of a <a href="/wiki/Private_branch_exchange" class="mw-redirect" title="Private branch exchange">private branch exchange</a> (PBX). In conjunction with suitable <a href="/wiki/Telephony" title="Telephony">telephony</a> hardware interfaces and network applications, Asterisk is used to establish and control <a href="/wiki/Telephone_call" title="Telephone call">telephone calls</a> between <a href="/wiki/Telecommunication" class="mw-redirect" title="Telecommunication">telecommunication</a> endpoints such as customary <a href="/wiki/Telephone" title="Telephone">telephone</a> sets, destinations on the <a href="/wiki/Public_switched_telephone_network" title="Public switched telephone network">public switched telephone network</a> (PSTN) and devices or services on <a href="/wiki/Voice_over_Internet_Protocol" class="mw-redirect" title="Voice over Internet Protocol">voice over Internet Protocol</a> (VoIP) networks. Its name comes from the <a href="/wiki/Asterisk" title="Asterisk">asterisk</a> (*) symbol for a signal used in <a href="/wiki/Dual-tone_multi-frequency_signaling" class="mw-redirect" title="Dual-tone multi-frequency signaling">dual-tone multi-frequency</a> (DTMF) dialing. </p><p>Asterisk was created in 1999 by <a href="/wiki/Mark_Spencer_(computer_engineer)" title="Mark Spencer (computer engineer)">Mark Spencer</a> of <a href="/wiki/Digium" title="Digium">Digium</a>, which, since 2018, has been a division of <a href="/wiki/Sangoma_Technologies_Corporation" title="Sangoma Technologies Corporation">Sangoma Technologies Corporation</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Originally designed for <a href="/wiki/Linux" title="Linux">Linux</a>,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Asterisk runs on a variety of <a href="/wiki/Operating_system" title="Operating system">operating systems</a>, including <a href="/wiki/NetBSD" title="NetBSD">NetBSD</a>, <a href="/wiki/OpenBSD" title="OpenBSD">OpenBSD</a>, <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a>, <a href="/wiki/MacOS" title="MacOS">macOS</a>, and <a href="/wiki/Solaris_(operating_system)" class="mw-redirect" title="Solaris (operating system)">Solaris</a>, and can be installed in embedded systems based on <a href="/wiki/OpenWrt" title="OpenWrt">OpenWrt</a>.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Features">Features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Asterisk_(PBX)&action=edit&section=1" title="Edit section: Features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Asterisk software includes many features available in commercial and proprietary PBX systems: <a href="/wiki/Voice_mail" class="mw-redirect" title="Voice mail">voice mail</a>, <a href="/wiki/Conference_call" title="Conference call">conference calling</a>, <a href="/wiki/Interactive_voice_response" title="Interactive voice response">interactive voice response</a> (phone menus), and <a href="/wiki/Automatic_call_distribution" class="mw-redirect" title="Automatic call distribution">automatic call distribution</a>. Users can create new functionality by writing dial plan scripts in several of Asterisk's own <i>extensions</i> languages by adding custom loadable modules written in PHP or <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> or by implementing <i><a href="/wiki/Asterisk_Gateway_Interface" title="Asterisk Gateway Interface">Asterisk Gateway Interface</a></i> (AGI) programs using any programming language capable of communicating via the standard streams system (<a href="/wiki/Stdin" class="mw-redirect" title="Stdin">stdin</a> and <a href="/wiki/Stdout" class="mw-redirect" title="Stdout">stdout</a>) or by network TCP sockets. </p><p>Asterisk supports several standard <a href="/wiki/Voice_over_IP" title="Voice over IP">VOIP</a> protocols, including the <a href="/wiki/Session_Initiation_Protocol" title="Session Initiation Protocol">Session Initiation Protocol</a> (SIP), the <a href="/wiki/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol">Media Gateway Control Protocol</a> (MGCP), and <a href="/wiki/H.323" title="H.323">H.323</a>. Asterisk supports most SIP telephones, acting both as registrar and <a href="/wiki/Back-to-back_user_agent" title="Back-to-back user agent">back-to-back user agent</a>. It can serve as a gateway between IP phones and the PSTN via T- or E-carrier interfaces or analog FXO cards. The <a href="/wiki/Inter-Asterisk_eXchange" title="Inter-Asterisk eXchange">Inter-Asterisk eXchange</a> (IAX) protocol, RFC 5456, native to Asterisk, provides efficient <a href="/wiki/Trunking" title="Trunking">trunking</a> of calls between Asterisk PBX systems in addition to distributing some configuration logic. Many VoIP service providers support it for call completion into the PSTN, often because they themselves have deployed Asterisk or offer it as a hosted application. Some telephones also support the IAX protocol. </p><p>By supporting a variety of traditional and VoIP telephony services, Asterisk allows deployers to build telephone systems, or migrate existing systems to new technologies. Some sites are using Asterisk to replace proprietary PBXes, others provide additional features, such as voice mail or voice response menus, or virtual <a href="/wiki/Call_shop" title="Call shop">call shops</a>, or to reduce cost by carrying both local and long-distance calls over the Internet. </p><p>In addition to VoIP protocols, Asterisk supports traditional circuit-switching protocols such as <a href="/wiki/Integrated_Services_Digital_Network" class="mw-redirect" title="Integrated Services Digital Network">ISDN</a> and <a href="/wiki/Signalling_System_No._7" title="Signalling System No. 7">SS7</a>. This requires appropriate hardware interface cards, marketed by third-party vendors. Each protocol requires the installation of software modules. In Asterisk release 14 the <a href="/wiki/Opus_(audio_format)" title="Opus (audio format)">Opus audio codec</a> is supported. </p> <div class="mw-heading mw-heading2"><h2 id="Internationalization">Internationalization</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Asterisk_(PBX)&action=edit&section=2" title="Edit section: Internationalization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>While initially developed in the <a href="/wiki/United_States" title="United States">United States</a>, Asterisk has become a popular <a href="/wiki/Voice_over_Internet_Protocol" class="mw-redirect" title="Voice over Internet Protocol">VoIP</a> PBX worldwide. It allows having multiple sets of voice prompts identified by language (and even multiple sets of prompts for each language) as well as support for time formats in different languages. Several sets of prompts for the interactive voice response and voice mail features are included with Asterisk: American, British, and Australian English, Canadian French, Japanese, Russian, Mexican Spanish and Swedish.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> A few novelty prompts are offered, such as jokes<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> and a themed "zombie apocalypse" message for <a href="/wiki/Halloween" title="Halloween">Halloween</a>.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> Additionally, voice sets are offered for commercial sale in various languages, dialects, and genders. </p><p>The default set of English-language Asterisk prompts are recorded by professional telephone voice Allison Smith.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Derived_products">Derived products</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Asterisk_(PBX)&action=edit&section=3" title="Edit section: Derived products"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Asterisk is a core component in many commercial products and open-source projects. Some of the commercial products are hardware and software bundles, for which the manufacturer supports and releases the software with an open-source distribution model. </p> <ul><li><a href="/wiki/AskoziaPBX" title="AskoziaPBX">AskoziaPBX</a>, a fork of the <a href="/wiki/M0n0wall" title="M0n0wall">m0n0wall</a> project, uses Asterisk PBX software to realize all telephony functions.</li> <li>AstLinux is a "Network Appliance for Communications" open-source software distribution.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/FreePBX" title="FreePBX">FreePBX</a>, an open-source graphical user interface, bundles Asterisk as the core of its <a href="/wiki/FreePBX_Distro" title="FreePBX Distro">FreePBX Distro</a><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/LinuxMCE" title="LinuxMCE">LinuxMCE</a> bundles Asterisk to provide telephony; there is also an embedded version of Asterisk for OpenWrt routers.</li> <li>PBX in a Flash/Incredible PBX and <a href="/wiki/Trixbox" title="Trixbox">trixbox</a> are software PBXes based on Asterisk.</li> <li><a href="/wiki/Elastix" title="Elastix">Elastix</a> previously used Asterisk, <a href="/wiki/HylaFAX" title="HylaFAX">HylaFAX</a>, <a href="/wiki/Openfire" title="Openfire">Openfire</a> and <a href="/wiki/Postfix_(software)" title="Postfix (software)">Postfix</a> to offer PBX, fax, instant messaging and email functions, respectively, before switching to <a href="/wiki/3CX" title="3CX">3CX</a>.</li> <li><a href="/wiki/Issabel" title="Issabel">Issabel</a> is an open-source <a href="/wiki/Unified_Communications" class="mw-redirect" title="Unified Communications">Unified Communications</a> software which uses Asterisk for telephony functions. It was forked from the open-source versions of Elastix when 3CX acquired it.</li> <li><a href="/wiki/*astTECS" title="*astTECS">*astTECS</a> uses Asterisk in its VoIP and mobile gateways.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Grandstream_Networks" title="Grandstream Networks">Grandstream's</a> UCM series of IP-PBX appliances uses Asterisk with a custom web interface.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup></li> <li><a href="/w/index.php?title=E-MetroTel_UCX&action=edit&redlink=1" class="new" title="E-MetroTel UCX (page does not exist)">E-MetroTel UCX</a> is a system developed by former <a href="/wiki/Nortel" title="Nortel">Nortel</a> engineers, running on Asterisk, designed to work with Nortel's digital and IP phones, as well as to integrate with other Nortel equipment. It also works with other products from other vendors, including <a href="/wiki/NEC" title="NEC">NEC</a>, <a href="/wiki/Mitel" title="Mitel">Mitel</a>, <a href="/wiki/Avaya" title="Avaya">Avaya</a>, and <a href="/wiki/Cisco" title="Cisco">Cisco</a>.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li></ul> <p>Various add-on products, often commercial, are available that extend Asterisk features and capabilities. </p><p>The standard voice prompts included with the system are free. A business can purchase matching voice announcements of its company name, IVR menu options and employee or department names (as a library of live recordings of common names<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> or a set of fully customised prompts recorded by the same professional voice talent) at additional cost for seamless integration into the system. </p><p>Other add-ons provide fax support, text-to-speech, additional <a href="/wiki/Codec" title="Codec">codecs</a> and new features.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> Some third-party add-ons are free;<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> a few even support embedded platforms such as the <a href="/wiki/Raspberry_Pi" title="Raspberry Pi">Raspberry Pi</a>.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Asterisk_(PBX)&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1266661725">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{margin:0.5em 1em 0.5em 0}.mw-parser-output .portalright{clear:right;float:right;margin:0.5em 0 0.5em 1em}}</style><ul role="navigation" aria-label="Portals" class="noprint portalbox portalborder portalright"> <li class="portalbox-entry"><span class="portalbox-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/28px-Free_and_open-source_software_logo_%282009%29.svg.png" decoding="async" width="28" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/42px-Free_and_open-source_software_logo_%282009%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/56px-Free_and_open-source_software_logo_%282009%29.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span></span><span class="portalbox-link"><a href="/wiki/Portal:Free_and_open-source_software" title="Portal:Free and open-source software">Free and open-source software portal</a></span></li></ul> <ul><li><a href="/wiki/Comparison_of_VoIP_software" title="Comparison of VoIP software">Comparison of VoIP software</a></li> <li><a href="/wiki/DUNDi" class="mw-redirect" title="DUNDi">DUNDi</a></li> <li><a href="/wiki/FreeSWITCH" title="FreeSWITCH">FreeSWITCH IPBX</a></li> <li><a href="/wiki/GNU_Gatekeeper" title="GNU Gatekeeper">GateKeeper H.323</a></li> <li><a href="/wiki/GNU_SIP_Witch" title="GNU SIP Witch">GNU SIP Witch</a></li> <li><a href="/wiki/List_of_free_and_open-source_software_packages" title="List of free and open-source software packages">List of free and open-source software packages</a></li> <li><a href="/wiki/List_of_SIP_software" title="List of SIP software">List of SIP software</a></li> <li><a href="/wiki/OpenBTS" title="OpenBTS">OpenBTS</a></li> <li><a href="/wiki/SIP_Express_Router" class="mw-redirect" title="SIP Express Router">SIP Express Router</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Asterisk_(PBX)&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-asterisk-21-series-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-asterisk-21-series_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-21-current.md">"ChangeLog-21-current"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">22 May</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=ChangeLog-21-current&rft_id=https%3A%2F%2Fdownloads.asterisk.org%2Fpub%2Ftelephony%2Fasterisk%2FChangeLog-21-current.md&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-asterisk-20-series-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-asterisk-20-series_2-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-20-current.md">"ChangeLog-20-current"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">27 Oct</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=ChangeLog-20-current&rft_id=https%3A%2F%2Fdownloads.asterisk.org%2Fpub%2Ftelephony%2Fasterisk%2FChangeLog-20-current.md&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-asterisk-19-series-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-asterisk-19-series_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-19-current.md">"ChangeLog-19-current"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">27 Oct</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=ChangeLog-19-current&rft_id=https%3A%2F%2Fdownloads.asterisk.org%2Fpub%2Ftelephony%2Fasterisk%2FChangeLog-19-current.md&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-asterisk-18-series-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-asterisk-18-series_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-18-current.md">"ChangeLog-18-current"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">27 Oct</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=ChangeLog-18-current&rft_id=https%3A%2F%2Fdownloads.asterisk.org%2Fpub%2Ftelephony%2Fasterisk%2FChangeLog-18-current.md&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/asterisk/asterisk/blob/master/LICENSE">"Asterisk LICENSE"</a>. <i><a href="/wiki/GitHub" title="GitHub">GitHub</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">2020-02-13</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=Asterisk+LICENSE&rft_id=https%3A%2F%2Fgithub.com%2Fasterisk%2Fasterisk%2Fblob%2Fmaster%2FLICENSE&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFOlejniczakKirby2007" class="citation book cs1">Olejniczak, Stephen P.; Kirby, Brady (2007). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/asteriskfordummi0000olej"><i>Asterisk For Dummies</i></a></span>. <a href="/wiki/John_Wiley_%26_Sons" class="mw-redirect" title="John Wiley & Sons">John Wiley & Sons</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780470098547" title="Special:BookSources/9780470098547"><bdi>9780470098547</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Asterisk+For+Dummies&rft.pub=John+Wiley+%26+Sons&rft.date=2007&rft.isbn=9780470098547&rft.aulast=Olejniczak&rft.aufirst=Stephen+P.&rft.au=Kirby%2C+Brady&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fasteriskfordummi0000olej&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFVan_MeggelenSmithMadsen2007" class="citation book cs1">Van Meggelen, Jim; Smith, Jared; Madsen, Leif (2007). <i>Asterisk: The Future of Telephony</i>. <a href="/wiki/O%27Reilly_Media,_Inc." class="mw-redirect" title="O'Reilly Media, Inc.">O'Reilly Media, Inc.</a> <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780596510480" title="Special:BookSources/9780596510480"><bdi>9780596510480</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Asterisk%3A+The+Future+of+Telephony&rft.pub=O%27Reilly+Media%2C+Inc.&rft.date=2007&rft.isbn=9780596510480&rft.aulast=Van+Meggelen&rft.aufirst=Jim&rft.au=Smith%2C+Jared&rft.au=Madsen%2C+Leif&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">The README for version 0.1.0 states: "Currently, the Asterisk Open Source PBX is only known to run on the Linux OS, although it may be portable to other UNIX-like operating systems as well." See <a rel="nofollow" class="external text" href="http://git.asterisk.org/gitweb/?p=asterisk/asterisk.git;a=blob;f=README;h=c50c462a7bd587dc39c9b16b862d7cf824c1fe80;hb=da258e1541aff8da8512849c302748fde369c8ab">here</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170212090901/http://git.asterisk.org/gitweb/?p=asterisk%2Fasterisk.git%3Ba%3Dblob%3Bf%3DREADME%3Bh%3Dc50c462a7bd587dc39c9b16b862d7cf824c1fe80%3Bhb%3Dda258e1541aff8da8512849c302748fde369c8ab">Archived</a> 2017-02-12 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://openwrt.org/docs/guide-user/services/voip/asterisk">"Asterisk on OpenWrt"</a>. 6 June 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-06-10</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Asterisk+on+OpenWrt&rft.date=2018-06-06&rft_id=https%3A%2F%2Fopenwrt.org%2Fdocs%2Fguide-user%2Fservices%2Fvoip%2Fasterisk&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140810030554/http://doc.astlinux.org/userdoc:boot-usb-storage">AstLinux: Boot via USB Flash Storage</a></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://downloads.asterisk.org/pub/telephony/sounds/">download page of sound files for Asterisk</a></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text">ץ <a rel="nofollow" class="external text" href="http://www.speechtechblog.com/2011/02/16/you-are-not-the-next-caller-in-line">"You are not the next caller in line"</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160304093043/http://www.speechtechblog.com/2011/02/16/you-are-not-the-next-caller-in-line">Archived</a> 2016-03-04 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, parody on-hold message where a pre-recorded Allison Smith sheepishly confesses (at 0:00:45) that the caller is actually *not* next in queue and would be lucky to get a response at 11:30pm from the cleaning lady after other workers had left for the day.</span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20160305004354/http://go.digium.com/zombie-proof-your-phone-system">"Zombie-Proof Your Phone System"</a>. Go.digium.com. Archived from <a rel="nofollow" class="external text" href="http://go.digium.com/zombie-proof-your-phone-system">the original</a> on 2016-03-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-01-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Zombie-Proof+Your+Phone+System&rft.pub=Go.digium.com&rft_id=http%3A%2F%2Fgo.digium.com%2Fzombie-proof-your-phone-system&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150118082439/http://theivrvoice.com/asterisk-voice-recording/">"Asterisk Voice Recordings"</a>. <i>The IVR Voice</i>. Archived from <a rel="nofollow" class="external text" href="http://theivrvoice.com/asterisk-voice-recording/">the original</a> on 2015-01-18<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-01-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+IVR+Voice&rft.atitle=Asterisk+Voice+Recordings&rft_id=http%3A%2F%2Ftheivrvoice.com%2Fasterisk-voice-recording%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.astlinux-project.org/">astlinux-project.org</a></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFMadsenJim_Van_MeggelenRussell_Bryant2013" class="citation book cs1">Madsen, Leif; Jim Van Meggelen; Russell Bryant (2013). <a rel="nofollow" class="external text" href="http://shop.oreilly.com/product/0636920025894.do"><i>Asterisk: The Definitive Guide, 4th Edition</i></a> (4th ed.). O'Reilly Media. p. 800. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4493-3242-6" title="Special:BookSources/978-1-4493-3242-6"><bdi>978-1-4493-3242-6</bdi></a>. <q>FreePBX, the juggernaut of the Asterisk community. This interface (which is at the heart of many of the most popular Asterisk distributions, such as AsteriskNOW, Elastix, the FreePBX Distro, and PBX in a Flash), is unarguably a very large part of why Asterisk has been as successful as it has. With the FreePBX interface, you can configure and manage many aspects of an Asterisk system without touching a single configuration file. While we purists may like everyone to work only with the config files, we recognize that for many, learning Linux and editing these files by hand is simply not going to happen. For those folks, there is FreePBX, and it has our respect for the important contributions it has made to the success of Asterisk.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Asterisk%3A+The+Definitive+Guide%2C+4th+Edition&rft.pages=800&rft.edition=4th&rft.pub=O%27Reilly+Media&rft.date=2013&rft.isbn=978-1-4493-3242-6&rft.aulast=Madsen&rft.aufirst=Leif&rft.au=Jim+Van+Meggelen&rft.au=Russell+Bryant&rft_id=http%3A%2F%2Fshop.oreilly.com%2Fproduct%2F0636920025894.do&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.voip-info.org/asttecs-the-ip-pbx-people/">"astTECS - THE IP-PBX PEOPLE"</a>. <i>VoIP-Info</i>. 12 July 2008.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=VoIP-Info&rft.atitle=astTECS+-+THE+IP-PBX+PEOPLE&rft.date=2008-07-12&rft_id=https%3A%2F%2Fwww.voip-info.org%2Fasttecs-the-ip-pbx-people%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.grandstream.com/hubfs/Product_Documentation/UCM6300_Audio_Series/Datasheet_UCM6300_Audio_Series_English.pdf">"Datasheet_UCM6300_Audio_Series_English.pdf"</a> <span class="cs1-format">(PDF)</span><span class="reference-accessdate">. Retrieved <span class="nowrap">2025-01-21</span></span>. <q>Based on Asterisk* version 16 open source telephony operating system</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Datasheet_UCM6300_Audio_Series_English.pdf&rft_id=https%3A%2F%2Fwww.grandstream.com%2Fhubfs%2FProduct_Documentation%2FUCM6300_Audio_Series%2FDatasheet_UCM6300_Audio_Series_English.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.emetrotel.com/migration-e-metrotel/">"E-MetroTel Green Migration"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2025-01-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=E-MetroTel+Green+Migration&rft_id=https%3A%2F%2Fwww.emetrotel.com%2Fmigration-e-metrotel%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.asteriskexchange.com/listings/1037">"Allison On Demand"</a>. <i>AsteriskExchange.com</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=AsteriskExchange.com&rft.atitle=Allison+On+Demand&rft_id=http%3A%2F%2Fwww.asteriskexchange.com%2Flistings%2F1037&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150316140633/http://www.digium.com/en/products/software">"Asterisk Software Add-Ons"</a>. Digium. 2015-12-29. Archived from <a rel="nofollow" class="external text" href="http://www.digium.com/en/products/software">the original</a> on 2015-03-16<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-01-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Asterisk+Software+Add-Ons&rft.pub=Digium&rft.date=2015-12-29&rft_id=http%3A%2F%2Fwww.digium.com%2Fen%2Fproducts%2Fsoftware&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-22">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFRiddell2009" class="citation web cs1">Riddell, Matt (2009-08-08). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150426180439/http://www.venturevoip.com/news.php?rssid=2184">"35 Great free Asterisk applications"</a>. Venturevoip.com. Archived from <a rel="nofollow" class="external text" href="http://www.venturevoip.com/news.php?rssid=2184">the original</a> on 2015-04-26<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-01-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=35+Great+free+Asterisk+applications&rft.pub=Venturevoip.com&rft.date=2009-08-08&rft.aulast=Riddell&rft.aufirst=Matt&rft_id=http%3A%2F%2Fwww.venturevoip.com%2Fnews.php%3Frssid%3D2184&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://nerdvittles.com/?p=6072">"The 5-Minute PBX: Incredible PBX 11 and Incredible Fax Get a Facelift"</a>. Nerd Vittles. 2013-06-18<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-01-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+5-Minute+PBX%3A+Incredible+PBX+11+and+Incredible+Fax+Get+a+Facelift&rft.pub=Nerd+Vittles&rft.date=2013-06-18&rft_id=http%3A%2F%2Fnerdvittles.com%2F%3Fp%3D6072&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAsterisk+%28PBX%29" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Asterisk_(PBX)&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://www.asterisk.org/">Official website</a></span></span> <span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q622754#P856" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Asterisk_(PBX)&oldid=1280076666">https://en.wikipedia.org/w/index.php?title=Asterisk_(PBX)&oldid=1280076666</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Asterisk_(PBX)" title="Category:Asterisk (PBX)">Asterisk (PBX)</a></li><li><a href="/wiki/Category:Free_VoIP_software" title="Category:Free VoIP software">Free VoIP software</a></li><li><a href="/wiki/Category:Free_business_software" title="Category:Free business software">Free business software</a></li><li><a href="/wiki/Category:Free_software_programmed_in_C" title="Category:Free software programmed in C">Free software programmed in C</a></li><li><a href="/wiki/Category:Free_communication_software" title="Category:Free communication software">Free communication software</a></li><li><a href="/wiki/Category:Telephone_exchange_equipment" title="Category:Telephone exchange equipment">Telephone exchange equipment</a></li><li><a href="/wiki/Category:Videotelephony" title="Category:Videotelephony">Videotelephony</a></li><li><a href="/wiki/Category:Lua_(programming_language)-scriptable_software" title="Category:Lua (programming language)-scriptable software">Lua (programming language)-scriptable software</a></li><li><a href="/wiki/Category:1999_software" title="Category:1999 software">1999 software</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Webarchive_template_wayback_links" title="Category:Webarchive template wayback links">Webarchive template wayback links</a></li><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 12 March 2025, at 10:24<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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