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Available in 18 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-18" 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">18 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/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol – Catalan" lang="ca" hreflang="ca" data-title="Media Gateway Control Protocol" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Media_Gateway_Control_Protocol_(Protokoll)" title="Media Gateway Control Protocol (Protokoll) – German" lang="de" hreflang="de" data-title="Media Gateway Control Protocol (Protokoll)" 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/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol – Spanish" lang="es" hreflang="es" data-title="Media Gateway Control Protocol" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%BE%D8%B1%D9%88%D8%AA%DA%A9%D9%84_%DA%A9%D9%86%D8%AA%D8%B1%D9%84_%D8%AF%D8%B1%D9%88%D8%A7%D8%B2%D9%87_%D8%B1%D8%B3%D8%A7%D9%86%D9%87%E2%80%8C%D8%A7%DB%8C" title="پروتکل کنترل دروازه رسانه‌ای – Persian" lang="fa" hreflang="fa" data-title="پروتکل کنترل دروازه رسانه‌ای" 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/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol – French" lang="fr" hreflang="fr" data-title="Media Gateway Control Protocol" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%AF%B8%EB%94%94%EC%96%B4_%EA%B2%8C%EC%9D%B4%ED%8A%B8%EC%9B%A8%EC%9D%B4_%EC%BB%A8%ED%8A%B8%EB%A1%A4_%ED%94%84%EB%A1%9C%ED%86%A0%EC%BD%9C" title="미디어 게이트웨이 컨트롤 프로토콜 – Korean" lang="ko" hreflang="ko" data-title="미디어 게이트웨이 컨트롤 프로토콜" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/MGCP" title="MGCP – Italian" lang="it" hreflang="it" data-title="MGCP" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/MGCP" title="MGCP – Latvian" lang="lv" hreflang="lv" data-title="MGCP" 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%AE%E0%B5%80%E0%B4%A1%E0%B4%BF%E0%B4%AF_%E0%B4%97%E0%B5%87%E0%B4%B1%E0%B5%8D%E0%B4%B1%E0%B5%8D%E2%80%8C%E0%B4%B5%E0%B5%87_%E0%B4%95%E0%B5%BA%E0%B4%9F%E0%B5%8D%E0%B4%B0%E0%B5%8B%E0%B5%BE_%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B5%8B%E0%B4%9F%E0%B5%8D%E0%B4%9F%E0%B5%8B%E0%B4%95%E0%B5%8D%E0%B4%95%E0%B5%8B%E0%B5%BE" title="മീഡിയ ഗേറ്റ്‌വേ കൺട്രോൾ പ്രോട്ടോക്കോൾ – Malayalam" lang="ml" hreflang="ml" data-title="മീഡിയ ഗേറ്റ്‌വേ കൺട്രോൾ പ്രോട്ടോക്കോൾ" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol – Malay" lang="ms" hreflang="ms" data-title="Media Gateway Control Protocol" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/MGCP" title="MGCP – Japanese" lang="ja" hreflang="ja" data-title="MGCP" 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-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/MGCP" title="MGCP – Portuguese" lang="pt" hreflang="pt" data-title="MGCP" 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/MGCP" title="MGCP – Romanian" lang="ro" hreflang="ro" data-title="MGCP" 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/MGCP" title="MGCP – Russian" lang="ru" hreflang="ru" data-title="MGCP" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/MGCP" title="MGCP – Turkish" lang="tr" hreflang="tr" data-title="MGCP" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/MGCP" title="MGCP – Ukrainian" lang="uk" hreflang="uk" data-title="MGCP" 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/MGCP" title="MGCP – Vietnamese" lang="vi" hreflang="vi" data-title="MGCP" 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-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/Media_Gateway_Control_Protocol_(MGCP)" title="Media Gateway Control Protocol (MGCP) – Yoruba" lang="yo" hreflang="yo" data-title="Media Gateway Control Protocol (MGCP)" data-language-autonym="Yorùbá" data-language-local-name="Yoruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1483431#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu 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.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" style="width:26em;"><caption class="infobox-title summary">Media Gateway Control Protocol</caption><tbody><tr><td colspan="2" class="infobox-subheader"><a href="/wiki/Communication_protocol" title="Communication protocol">Communication protocol</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;">Purpose</th><td class="infobox-data"><a href="/wiki/Voice_over_IP" title="Voice over IP">Voice over IP</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;">Developer(s)</th><td class="infobox-data"><a href="/wiki/Bellcore" class="mw-redirect" title="Bellcore">Bellcore</a>, <a href="/wiki/Cisco" title="Cisco">Cisco</a>, <a href="/wiki/Level_3_Communications" title="Level 3 Communications">Level 3</a>, <a href="/wiki/IETF" class="mw-redirect" title="IETF">IETF</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;">Introduction</th><td class="infobox-data">1998<span class="noprint">; 27 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1998</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;"><a href="/wiki/OSI_model" title="OSI model">OSI layer</a></th><td class="infobox-data"><a href="/wiki/Application_layer" title="Application layer">Application layer</a> (7)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;"><a href="/wiki/Request_for_Comments" title="Request for Comments">RFC(s)</a></th><td class="infobox-data"> <ul><li><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 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title="IPsec">IPsec</a></li> <li><a href="/wiki/Category:Internet_layer_protocols" title="Category:Internet layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Link_layer" title="Link layer">Link layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Address_Resolution_Protocol" title="Address Resolution Protocol">ARP</a></li> <li><a href="/wiki/Tunneling_protocol" title="Tunneling protocol">Tunnels</a></li> <li><a href="/wiki/Point-to-Point_Protocol" title="Point-to-Point Protocol">PPP</a></li> <li><a href="/wiki/Medium_access_control" title="Medium access control">MAC</a></li> <li><a href="/wiki/Category:Link_protocols" title="Category:Link protocols"><i>more...</i></a></li></ul></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Internet_protocol_suite" title="Template:Internet protocol suite"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Internet_protocol_suite" title="Template talk:Internet protocol suite"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Internet_protocol_suite" title="Special:EditPage/Template:Internet protocol suite"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p>The <b>Media Gateway Control Protocol</b> (<b>MGCP</b>) is a <a href="/wiki/Communication_protocol" title="Communication protocol">telecommunication protocol</a> for signaling and call control in hybrid <a href="/wiki/Voice_over_IP" title="Voice over IP">voice over IP</a> (VoIP) and traditional <a href="/wiki/Telecommunication" class="mw-redirect" title="Telecommunication">telecommunication</a> systems. It implements the <a href="/wiki/Media_gateway_control_protocol_architecture" title="Media gateway control protocol architecture">media gateway control protocol architecture</a> for controlling <a href="/wiki/Media_gateway" title="Media gateway">media gateways</a> connected to the <a href="/wiki/Public_switched_telephone_network" title="Public switched telephone network">public switched telephone network</a> (PSTN).<sup id="cite_ref-RFC2805_1-0" class="reference"><a href="#cite_note-RFC2805-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The media gateways provide conversion of traditional electronic media to the <a href="/wiki/Internet_Protocol" title="Internet Protocol">Internet Protocol</a> (IP) network. The protocol is a successor to the <a href="/wiki/Simple_Gateway_Control_Protocol" title="Simple Gateway Control Protocol">Simple Gateway Control Protocol</a> (SGCP), which was developed by <a href="/wiki/Bellcore" class="mw-redirect" title="Bellcore">Bellcore</a> and <a href="/wiki/Cisco" title="Cisco">Cisco</a>, and the <a href="/wiki/Internet_Protocol_Device_Control" title="Internet Protocol Device Control">Internet Protocol Device Control</a> (IPDC).<sup id="cite_ref-level3_2-0" class="reference"><a href="#cite_note-level3-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>The methodology of MGCP reflects the structure of the PSTN with the control over the network residing in a call control center <a href="/wiki/Softswitch" title="Softswitch">softswitch</a>, which is analogous to the central office in the telephone network. The endpoints are low-intelligence devices, mostly executing control commands from a media gateway controller, also called <i>call agent</i>, in the softswitch and providing result indications in response. The protocol represents a decomposition of other VoIP models, such as <a href="/wiki/H.323" title="H.323">H.323</a> and the <a href="/wiki/Session_Initiation_Protocol" title="Session Initiation Protocol">Session Initiation Protocol</a> (SIP), in which the endpoint devices of a call have higher levels of signaling intelligence. </p><p>MGCP is a text-based protocol consisting of commands and responses. It uses the <a href="/wiki/Session_Description_Protocol" title="Session Description Protocol">Session Description Protocol</a> (SDP) for specifying and negotiating the media streams to be transmitted in a call session and the <a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">Real-time Transport Protocol</a> (RTP) for framing the media streams. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Architecture">Architecture</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Media_Gateway_Control_Protocol&action=edit&section=1" title="Edit section: Architecture"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Converged_Network_Architecture.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Converged_Network_Architecture.png/400px-Converged_Network_Architecture.png" decoding="async" width="400" height="219" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Converged_Network_Architecture.png/600px-Converged_Network_Architecture.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/95/Converged_Network_Architecture.png/800px-Converged_Network_Architecture.png 2x" data-file-width="1704" data-file-height="934" /></a><figcaption> Gateway Control Protocol Relationship</figcaption></figure> <p>The <a href="/wiki/Media_gateway_control_protocol_architecture" title="Media gateway control protocol architecture">media gateway control protocol architecture</a> and its methodologies and programming interfaces are described in RFC 2805.<sup id="cite_ref-RFC2805_1-1" class="reference"><a href="#cite_note-RFC2805-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>MGCP is a master-slave protocol in which <a href="/wiki/Media_gateway" title="Media gateway">media gateways</a> (MGs) are controlled by a call control agent or softswitch. This controller is called a <a href="/wiki/Media_gateway_controller" class="mw-redirect" title="Media gateway controller">media gateway controller</a> (MGC) or call agent (CA). With the network protocol it can control each specific port on a media gateway. This facilitates centralized gateway administration and provides scalable IP telephony solutions. The distributed system is composed of at least one call agent and one or usually, multiple media gateways, which performs the conversion of media signals between circuit-switched and packet-switched networks, and at least one <a href="/wiki/Signaling_gateway" title="Signaling gateway">signaling gateway</a> (SG) when connected to the <a href="/wiki/PSTN" class="mw-redirect" title="PSTN">PSTN</a>. </p><p>MGCP presents a call control architecture with limited intelligence at the edge (endpoints, media gateways) and intelligence at the core controllers. The MGCP model assumes that call agents synchronize with each other to send coherent commands and responses to the gateways under their control. </p><p>The call agent uses MGCP to request event notifications, reports, status, and configuration data from the media gateway, as well as to specify connection parameters and activation of signals toward the PSTN telephony interface. </p><p>A softswitch is typically used in conjunction with signaling gateways, for access to <a href="/wiki/Signalling_System_No._7" title="Signalling System No. 7">Signalling System No. 7</a> (SS7) functionality, for example. The call agent does not use MGCP to control a signaling gateway; rather, SIGTRAN protocols are used to <a href="/wiki/Backhaul_(telecommunications)" title="Backhaul (telecommunications)">backhaul</a> signaling between a signaling gateway and the call agents. </p> <div class="mw-heading mw-heading3"><h3 id="Multiple_call_agents">Multiple call agents</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Media_Gateway_Control_Protocol&action=edit&section=2" title="Edit section: Multiple call agents"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Typically, a media gateway may be configured with a list of call agents from which it may accept control commands. </p><p>In principle, event notifications may be sent to different call agents for each endpoint on the gateway, according to the instructions received from the call agents by setting the NotifiedEntity parameter. In practice, however, it is usually desirable that all endpoints of a gateway are controlled by the same call agent; other call agents are available to provide redundancy in the event that the primary call agent fails, or loses contact with the media gateway. In the event of such a failure it is the backup call agent's responsibility to reconfigure the media gateway so that it reports to the backup call agent. The gateway may be audited to determine the controlling call agent, a query that may be used to resolve any conflicts. </p><p>In case of multiple call agents, MGCP assumes that they maintain knowledge of device state among themselves. Such failover features take into account both planned and unplanned outages. </p> <div class="mw-heading mw-heading2"><h2 id="Protocol_overview">Protocol overview</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Media_Gateway_Control_Protocol&action=edit&section=3" title="Edit section: Protocol overview"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>MGCP recognizes three essential elements of communication, the <i>media gateway controller</i> (call agent), the media gateway <i>endpoint</i>, and <i>connections</i> between these entities. A media gateway may host multiple endpoints and each endpoint should be able to engage in multiple connections. Multiple connections on the endpoints support calling features such as <a href="/wiki/Call_waiting" title="Call waiting">call waiting</a> and <a href="/wiki/Three-way_calling" class="mw-redirect" title="Three-way calling">three-way calling</a>. </p><p>MGCP is a text-based protocol using a command and response model. Commands and responses are encoded in messages that are structured and formatted with the whitespace characters <a href="/wiki/Space_(punctuation)" title="Space (punctuation)">space</a>, <a href="/wiki/Tab_key" title="Tab key">horizontal tab</a>, <a href="/wiki/Carriage_return" title="Carriage return">carriage return</a>, <a href="/wiki/Linefeed" class="mw-redirect" title="Linefeed">linefeed</a>, <a href="/wiki/Colon_(punctuation)" title="Colon (punctuation)">colon</a>, and <a href="/wiki/Full_stop" title="Full stop">full stop</a>. Messages are transmitted using the <a href="/wiki/User_Datagram_Protocol" title="User Datagram Protocol">User Datagram Protocol</a> (UDP). Media gateways use the <a href="/wiki/Port_number" class="mw-redirect" title="Port number">port number</a> 2427, and call agents use 2727 by default. </p><p>The message sequence of command (or request) and its response is known as a transaction, which is identified by the numerical Transaction Identifier exchanged in each transaction. The protocol specification defines nine standard commands that are distinguished by a four-letter command verb: AUEP, AUCX, CRCX, DLCX, EPCF, MDCX, NTFY, RQNT, and RSIP. Responses begin with a three-digit numerical response code that identifies the outcome or result of the transaction. </p><p>Two verbs are used by a call agent to query the state of an endpoint and its associated connections. </p> <ul><li>AUEP: Audit Endpoint</li> <li>AUCX: Audit Connection</li></ul> <p>Three verbs are used by a call agent to manage the connection to a media gateway endpoint. </p> <ul><li>CRCX: Create Connection</li> <li>DLCX: Delete Connection. This command may also be issued by an endpoint to terminate a connection.</li> <li>MDCX: Modify Connection. This command is used to alter operating characteristics of the connection, e.g. speech encoders, muting, half-duplex/full-duplex state and others.</li></ul> <p>One verb is used by a call agent to request notification of events occurring at the endpoint, and to apply signals to the connected PSTN network link, or to a connected telephony endpoint, e.g., a telephone. </p> <ul><li>RQNT: Request for Notification</li></ul> <p>One verb is used by an endpoint to indicate to the call agent that it has detected an event for which the call agent had previously requested notification with the RQNT command: </p> <ul><li>NTFY: Notify</li></ul> <p>One verb is used by a call agent to modify coding characteristics expected by the line side of the endpoint: </p> <ul><li>EPCF: Endpoint Configuration</li></ul> <p>One verb is used by an endpoint to indicate to the call agent that it is in the process of restarting: </p> <ul><li>RSIP: Restart In Progress</li></ul> <div class="mw-heading mw-heading2"><h2 id="Standards_documents">Standards documents</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Media_Gateway_Control_Protocol&action=edit&section=4" title="Edit section: Standards documents"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3435">3435</a> – Media Gateway Control Protocol (MGCP) Version 1.0 (this supersedes RFC 2705)</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3660">3660</a> – Basic Media Gateway Control Protocol (MGCP) Packages (informational)</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3661">3661</a> – Media Gateway Control Protocol (MGCP) Return Code Usage</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3064">3064</a> – MGCP CAS Packages</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3149">3149</a> – MGCP Business Phone Packages</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3991">3991</a> – Media Gateway Control Protocol (MGCP) Redirect and Reset Package</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3992">3992</a> – Media Gateway Control Protocol (MGCP) Lockstep State Reporting Mechanism (informational)</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2805">2805</a> – Media Gateway Control Protocol Architecture and Requirements</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" />RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2897">2897</a> – Proposal for an MGCP Advanced Audio Package</li></ul> <div class="mw-heading mw-heading2"><h2 id="Megaco">Megaco</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Media_Gateway_Control_Protocol&action=edit&section=5" title="Edit section: Megaco"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Another implementation of the <a href="/wiki/Media_gateway_control_protocol_architecture" title="Media gateway control protocol architecture">media gateway control protocol architecture</a> is the <a href="/wiki/H.248" title="H.248">H.248/Megaco</a> protocol, a collaboration of the <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">Internet Engineering Task Force</a> (RFC 3525) and the <a href="/wiki/International_Telecommunication_Union" title="International Telecommunication Union">International Telecommunication Union</a> (Recommendation H.248.1). Both protocols follow the guidelines of the overlying media gateway control protocol architecture, as described in RFC 2805. However, the protocols are incompatible due to differences in protocol syntax and underlying connection model. </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=Media_Gateway_Control_Protocol&action=edit&section=6" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/RTP_audio_video_profile" class="mw-redirect" title="RTP audio video profile">RTP audio video profile</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=Media_Gateway_Control_Protocol&action=edit&section=7" 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"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-RFC2805-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-RFC2805_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-RFC2805_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">RFC 2805, Media Gateway Control Protocol Architecture and Requirements, N. Greene, M. Ramalho, B. Rosen, IETF, April 2000</span> </li> <li id="cite_note-level3-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-level3_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="http://level3.mediaroom.com/index.php?s=23600&item=65733">"Level 3 Communications, Bellcore Announce Merger of Protocol Specifications for Voice Over IP"</a>. Level 3 Communications<span class="reference-accessdate">. Retrieved <span class="nowrap">8 June</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Level+3+Communications%2C+Bellcore+Announce+Merger+of+Protocol+Specifications+for+Voice+Over+IP&rft.pub=Level+3+Communications&rft_id=http%3A%2F%2Flevel3.mediaroom.com%2Findex.php%3Fs%3D23600%26item%3D65733&rfr_id=info%3Asid%2Fen.wikipedia.org%3AMedia+Gateway+Control+Protocol" class="Z3988"></span></span> </li> </ol></div></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=Media_Gateway_Control_Protocol&action=edit&section=8" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.packetizer.com/voip/mgcp">MGCP Information Site</a> Information related to MGCP</li> <li><a rel="nofollow" class="external text" href="http://www.packetizer.com/voip/h248/">H.248 Information Site</a> Information related to H.248/Megaco, including pointers to standards and draft specifications</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=Media_Gateway_Control_Protocol&oldid=1137335244">https://en.wikipedia.org/w/index.php?title=Media_Gateway_Control_Protocol&oldid=1137335244</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">Category</a>: <ul><li><a href="/wiki/Category:VoIP_protocols" title="Category:VoIP protocols">VoIP protocols</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: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><li><a href="/wiki/Category:Articles_lacking_in-text_citations_from_February_2023" title="Category:Articles lacking in-text citations from February 2023">Articles lacking in-text citations from February 2023</a></li><li><a href="/wiki/Category:All_articles_lacking_in-text_citations" title="Category:All articles lacking in-text citations">All articles lacking in-text citations</a></li><li><a href="/wiki/Category:Use_dmy_dates_from_September_2022" title="Category:Use dmy dates from September 2022">Use dmy dates from September 2022</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 4 February 2023, at 02:34<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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id="ca-ve-edit-sticky-header" tabindex="-1" data-event-name="ve-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-edit mw-ui-icon-wikimedia-wikimedia-edit"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-viewsource-sticky-header" tabindex="-1" data-event-name="ve-edit-protected-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-editLock mw-ui-icon-wikimedia-wikimedia-editLock"></span> <span></span> </a> </div> <div class="vector-sticky-header-buttons"> <button class="cdx-button cdx-button--weight-quiet mw-interlanguage-selector" id="p-lang-btn-sticky-header" tabindex="-1" data-event-name="ui.dropdown-p-lang-btn-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>18 languages</span> </button> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive" id="ca-addsection-sticky-header" tabindex="-1" data-event-name="addsection-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbleAdd-progressive mw-ui-icon-wikimedia-speechBubbleAdd-progressive"></span> <span>Add topic</span> </a> </div> <div class="vector-sticky-header-icon-end"> <div class="vector-user-links"> </div> </div> </div> </div> </div> <div class="mw-portlet mw-portlet-dock-bottom emptyPortlet" id="p-dock-bottom"> <ul> </ul> </div> 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