Telephony Signaling

<!DOCTYPE html> <html xmlns:fb="//www.facebook.com/2008/fbml" xmlns:og="//opengraphprotocol.org/schema/" lang="en" xml:lang="en" class="no-touch no-js"> <head> <meta charset="utf-8"> <meta name="HandheldFriendly" content="True" /> <meta name="MobileOptimized" content="320" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta name="rei" content="3/2/2022 10.39am est" /> <script tyle="text/javascript" src="/content/dam/cdc/j/cdcrSwitch.js"></script> <script type="text/javascript"> if (typeof cdc === "undefined"){ cdc = {}; } cdc.localizedLang="en/us"; if (window.cdcext === undefined) { window.cdcext = {}; } cdcext.customEnvironment = "prod"; if (window.cdclocale === undefined) { window.cdclocale = {}; } cdclocale.locale = cdc.localizedLang=="en/us"?"en_us":cdc.localizedLang; </script> <script src="/c/dam/cdc/t/ctm-core.js"></script> <script> window['adrum-start-time'] = new Date().getTime(); window.environ = "prod" ; </script> <script> if (window.cpe === undefined) { window.cpe = {}; } cpe.accountName = "prod"; cpe.config = ["cinf","dsc","pps"]; cpe.hideMethod = "elements"; window.targetGlobalSettings = JSON.parse('{\x22timeout\x22:4000}'); window.targetPageParamsAll = () => JSON.parse('{\x22entity\x22:\x22{\\\x22id\\\x22:\\\x221531030406554820\\\x22,\\\x22categoryId\\\x22:\\\x22Technologies,Voice,TSD Technology Support Protocol Home\\\x22}\x22}'); const bullseyeLibrary = `/etc.clientlibs/cisco-cdc/clientlibs/clientlib-external/resources/external/bullseye.js`; import(bullseyeLibrary); </script> <script src="/etc.clientlibs/cisco-cdc/clientlibs/clientlib-external/resources/regional-mbox/regional-mbox.js"></script> <title>Telephony Signaling - Cisco</title> <meta http-equiv="Content-type" content="text/html;charset=UTF-8" /> <meta name="description" content="This page contains information about Telephony Signaling technology." /> <meta name="title" content="Telephony Signaling" /> <meta name="templateName" content="supportTechnologySeries" /> <meta property="fb:app_id" content="156494687694418" /> <meta name="ioContentSource" content="WEM" /> <meta name="concept" content="Telephony Signaling" /> <meta name="docType" content="TSD Technology Support Protocol Home" /> <meta name="iaPath" content="cisco.com#Technologies#Voice#Telephony Signaling" /> <meta name="contentType" content="cisco.com#US#postSales" /> <meta name="locale" content="US" /> <meta name="language" content="en" /> <meta name="country" content="US" /> <meta name="CCID_Page" content="cc001784" /> <meta name="date" content="Mon Nov 13 15:06:58 PST 2017" /> <meta name="targetingParameter" content="Telephony Signaling:Technologies" /> <meta name="accessLevel" content="Customer" /> <meta name="accessLevel" content="Guest" /> <meta name="accessLevel" content="Partner" /> <meta name="entitlementExpression" content="contains( "0,1,2,3,4,7" , $profileField[3] )" /> <meta property="og:site_name" content="Cisco" /> <meta property="og:type" content="website" /> <meta property="og:title" content="Telephony Signaling" /> <meta property="og:description" content="This page contains information about Telephony Signaling technology." /> <meta property="og:url" content="https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html" /> <link rel="canonical" href="https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="x-default" href="https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="pt-br" href="https://www.cisco.com/c/pt_br/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="es-mx" href="https://www.cisco.com/c/es_mx/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="ko-kr" href="https://www.cisco.com/c/ko_kr/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="ja-jp" href="https://www.cisco.com/c/ja_jp/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="de-de" href="https://www.cisco.com/c/de_de/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="fr-ca" href="https://www.cisco.com/c/fr_ca/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="ar-ae" href="https://www.cisco.com/c/ar_ae/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="nl-nl" href="https://www.cisco.com/c/nl_nl/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="zh-tw" href="https://www.cisco.com/c/zh_tw/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="zh-cn" href="https://www.cisco.com/c/zh_cn/tech/voice/telephony-signaling/index.html"/> <link rel="alternate" hreflang="en-us" href="https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html"/> <script src="/etc.clientlibs/clientlibs/granite/jquery.min.js"></script> <script src="/etc.clientlibs/clientlibs/granite/utils.min.js"></script> <script src="/etc.clientlibs/clientlibs/granite/jquery/granite.min.js"></script> <script src="/etc.clientlibs/foundation/clientlibs/jquery.min.js"></script> <script src="/etc.clientlibs/foundation/clientlibs/shared.min.js"></script> <script src="/etc.clientlibs/cq/personalization/clientlib/underscore.min.js"></script> <script src="/etc.clientlibs/cq/personalization/clientlib/personalization/kernel.min.js"></script> <script src="/etc.clientlibs/cq/personalization/clientlib/personalization/kernel.min.js"></script> <script type="text/javascript"> $CQ(function() { CQ_Analytics.SegmentMgr.loadSegments("\/etc\/segmentation"); CQ_Analytics.ClientContextUtils.init("\/c\/dnc\/etc\/clientcontext\/default", "\/content\/en\/us\/tech\/voice\/telephony\u002Dsignaling\/index"); }); </script> <link rel="stylesheet" href="/etc/designs/cdc/clientlibs/responsive/css/cisco-sans.min.css" type="text/css"> <script src="/etc/designs/cdc/clientlibs/responsive/js/foundation.min.js"></script> <link rel="stylesheet" href="/etc/designs/cdc/clientlibs/responsive/css/responsive.min.css" type="text/css"> <script> sessionStorage.setItem("logOutIntermediateMessage", 'You are being logged out.'); </script>  <script type="application/ld+json"> [ { "@context": "http://www.schema.org", "@type": "WebPage", "name": "Telephony Signaling", "url": "https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html", "description": "This page contains information about Telephony Signaling technology.", "publisher": { "@type": "Corporation", "name": "Cisco" } }] </script>    <script>!function(e){var n="https://s.go-mpulse.net/boomerang/";if("False"=="True")e.BOOMR_config=e.BOOMR_config||{},e.BOOMR_config.PageParams=e.BOOMR_config.PageParams||{},e.BOOMR_config.PageParams.pci=!0,n="https://s2.go-mpulse.net/boomerang/";if(window.BOOMR_API_key="GKZXC-NS3SU-A7VFH-HKBHM-U7LKH",function(){function e(){if(!o){var e=document.createElement("script");e.id="boomr-scr-as",e.src=window.BOOMR.url,e.async=!0,i.parentNode.appendChild(e),o=!0}}function t(e){o=!0;var n,t,a,r,d=document,O=window;if(window.BOOMR.snippetMethod=e?"if":"i",t=function(e,n){var t=d.createElement("script");t.id=n||"boomr-if-as",t.src=window.BOOMR.url,BOOMR_lstart=(new Date).getTime(),e=e||d.body,e.appendChild(t)},!window.addEventListener&&window.attachEvent&&navigator.userAgent.match(/MSIE [67]\./))return window.BOOMR.snippetMethod="s",void t(i.parentNode,"boomr-async");a=document.createElement("IFRAME"),a.src="about:blank",a.title="",a.role="presentation",a.loading="eager",r=(a.frameElement||a).style,r.width=0,r.height=0,r.border=0,r.display="none",i.parentNode.appendChild(a);try{O=a.contentWindow,d=O.document.open()}catch(_){n=document.domain,a.src="javascript:var d=document.open();d.domain='"+n+"';void(0);",O=a.contentWindow,d=O.document.open()}if(n)d._boomrl=function(){this.domain=n,t()},d.write("<bo"+"dy onload='document._boomrl();'>");else if(O._boomrl=function(){t()},O.addEventListener)O.addEventListener("load",O._boomrl,!1);else if(O.attachEvent)O.attachEvent("onload",O._boomrl);d.close()}function a(e){window.BOOMR_onload=e&&e.timeStamp||(new Date).getTime()}if(!window.BOOMR||!window.BOOMR.version&&!window.BOOMR.snippetExecuted){window.BOOMR=window.BOOMR||{},window.BOOMR.snippetStart=(new Date).getTime(),window.BOOMR.snippetExecuted=!0,window.BOOMR.snippetVersion=12,window.BOOMR.url=n+"GKZXC-NS3SU-A7VFH-HKBHM-U7LKH";var i=document.currentScript||document.getElementsByTagName("script")[0],o=!1,r=document.createElement("link");if(r.relList&&"function"==typeof r.relList.supports&&r.relList.supports("preload")&&"as"in r)window.BOOMR.snippetMethod="p",r.href=window.BOOMR.url,r.rel="preload",r.as="script",r.addEventListener("load",e),r.addEventListener("error",function(){t(!0)}),setTimeout(function(){if(!o)t(!0)},3e3),BOOMR_lstart=(new Date).getTime(),i.parentNode.appendChild(r);else t(!1);if(window.addEventListener)window.addEventListener("load",a,!1);else if(window.attachEvent)window.attachEvent("onload",a)}}(),"".length>0)if(e&&"performance"in e&&e.performance&&"function"==typeof e.performance.setResourceTimingBufferSize)e.performance.setResourceTimingBufferSize();!function(){if(BOOMR=e.BOOMR||{},BOOMR.plugins=BOOMR.plugins||{},!BOOMR.plugins.AK){var n=""=="true"?1:0,t="",a="bdpnbeqx2cugez2bqnia-f-42f2b81c9-clientnsv4-s.akamaihd.net",i="false"=="true"?2:1,o={"ak.v":"39","ak.cp":"61004","ak.ai":parseInt("271834",10),"ak.ol":"0","ak.cr":6,"ak.ipv":4,"ak.proto":"http/1.1","ak.rid":"1b3feb5f","ak.r":50230,"ak.a2":n,"ak.m":"dsca","ak.n":"essl","ak.bpcip":"8.222.208.0","ak.cport":43520,"ak.gh":"23.39.162.18","ak.quicv":"","ak.tlsv":"tls1.2","ak.0rtt":"","ak.0rtt.ed":"","ak.csrc":"-","ak.acc":"reno","ak.t":"1732346704","ak.ak":"hOBiQwZUYzCg5VSAfCLimQ==R7fCbJ286/MOwbv76tggzCN8hnSaEVEowthhLHHR5I4vbSb6RclPzQAMKIy0jSwZGBMFjQV/WxwNomFAJGRktsX7OKzs0nVygY6+j+PgeLqFUOxY8AD3sGcvlLrq5ecpPkGrhW+v9EiYRjZlSYHCxyI5q3UIl5GR5Dqcl0dkG1oRY/3HvyPbPPQbPQcuUd+b9O+DffoTYzhKSajK990RoIedreh+Edwg/lCwNhZz5h90zcND6O98N+0nzrOlx0Mp2J4HGsO1jDG1pCFXB94q4c8WhVXhhOzKhVM3Pnk5+Knl5yEK8EfE4bhVdl1O9kLB1piftbflRSLKZ5GzQUieHPLuvN3KbdEimQIde5ylfG6tFOHQhJZE6fk9mWhn7e6nP58yYuAX53+0L8q0A21hRBjGX62rMIgiZdMgCMlp23w=","ak.pv":"517","ak.dpoabenc":"","ak.tf":i};if(""!==t)o["ak.ruds"]=t;var r={i:!1,av:function(n){var t="http.initiator";if(n&&(!n[t]||"spa_hard"===n[t]))o["ak.feo"]=void 0!==e.aFeoApplied?1:0,BOOMR.addVar(o)},rv:function(){var e=["ak.bpcip","ak.cport","ak.cr","ak.csrc","ak.gh","ak.ipv","ak.m","ak.n","ak.ol","ak.proto","ak.quicv","ak.tlsv","ak.0rtt","ak.0rtt.ed","ak.r","ak.acc","ak.t","ak.tf"];BOOMR.removeVar(e)}};BOOMR.plugins.AK={akVars:o,akDNSPreFetchDomain:a,init:function(){if(!r.i){var e=BOOMR.subscribe;e("before_beacon",r.av,null,null),e("onbeacon",r.rv,null,null),r.i=!0}return this},is_complete:function(){return!0}}}}()}(window);</script></head> <body id="wcq" class="fw-res cdc-support cdc-support-technology-series cdc-high-density cdc-transform"> <div id="fw-skiplinks"> <ul class="container"> <li><a id="skiplink-content" href="#fw-content">Skip to content</a></li> <li><a id="skiplink-search" href="#">Skip to search</a></li> <li><a id="skiplink-footer" href="#fw-footer-v2" class="last">Skip to footer</a></li> </ul> </div> <script type="module" src="/site/web-components/us/en/cdc-header.js"></script> <cdc-header></cdc-header> <nav class="fw-c-header__seo-links" aria-hidden="true" style="display:none"> <ul> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/index.html">Cisco.com Worldwide</a></li> <li><a tabindex="-1" href="/c/en/us/products/index.html">Products and Services</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/solutions/index.html">Solutions</a></li> <li><a tabindex="-1" href="/c/en/us/support/index.html">Support</a></li> <li><a tabindex="-1" href="/c/en/us/training-events.html">Learn</a></li> <li><a tabindex="-1" href="//www.cisco.com/c/en/us/about/sitemap.html">Explore Cisco</a></li> <li><a tabindex="-1" href="/c/en/us/buy.html">How to Buy</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/partners/index.html?dtid=odicdc001129">Partners Home</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/partners/cisco-partner-program/index.html?ccid=cc000864&dtid=odiprc001129">Partner Program</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/partners/support-help/index.html">Support</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/partners/tools/index.html?dtid=odiprc001129">Tools</a></li> <li><a tabindex="-1" href="https://locatr.cloudapps.cisco.com/WWChannels/LOCATR/pf/index.jsp#/">Find a Cisco Partner</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/partners/connect-with-a-partner/index.html?ccid=cc000864&dtid=odiprc001129">Meet our Partners</a></li> <li><a tabindex="-1" href="https://www.cisco.com/site/us/en/partners/index.html?dtid=odicdc001129">Become a Cisco Partner</a></li> </ul> </nav> <div id="fw-content" class="container grid"> <div class="row full" data-owner="ID"> <div class="col full "> <nav id="fw-breadcrumb" class="data-based" aria-label="breadcrumbs" data-owner="ID"> <ul itemscope itemtype="//schema.org/BreadcrumbList"> <li aria-hidden="true"><a href='#' class="skip"><span></span></a></li> <li itemprop='itemListElement' itemscope itemtype='//schema.org/ListItem'><a itemprop='item' href='/c/en/us/support/index.html'><span itemprop='name'>Support</span><meta itemprop='position' content='1' /></a><span class='caret'></span></li><li itemprop='itemListElement' itemscope itemtype='//schema.org/ListItem'><a itemprop='item' href='/c/en/us/tech/index.html'><span itemprop='name'>Technology Support</span><meta itemprop='position' content='2' /></a><span class='caret'></span></li> </ul> </nav> <script> if (window.cdc === undefined) { window.cdc = {}; } if (cdc.breadcrumb === undefined) { cdc.breadcrumb = (function () { let clone = document.querySelector('#fw-breadcrumb').cloneNode(true); let appendClone = function () { let hasBreadcrumb = document.querySelector('#fw-breadcrumb') !== null, firstMarquee = document.querySelectorAll('.dmc-mq')[0]; if (!hasBreadcrumb && firstMarquee !== undefined) { firstMarquee.querySelector('.frame .inset').insertBefore(this.clone, firstMarquee.querySelector('.frame .inset').firstElementChild); } }; return { clone: clone, appendClone: appendClone } }()); } //DE380224 var anchorChild = document.getElementsByTagName("a"); for(var i=0; i<anchorChild.length; i++){ if(anchorChild[i].getAttribute("itemprop")=="item") { if ( anchorChild[i].href.includes("%3Clocale%3E") ){ let anchorChildHREF = anchorChild[i].href; let docLocale = document.querySelector('meta[name="locale"]').getAttribute('content'); let docLanguage = document.querySelector('meta[name="language"]').getAttribute('content'); var docSeparator; if ((docLocale.toLowerCase() == "us") && (docLanguage.toLowerCase() == "en")) { docSeparator="/"; } else { docSeparator="_"; } let anchorURLReplace = docLanguage.toLowerCase() + docSeparator + docLocale.toLowerCase(); anchorChildHREF = anchorChildHREF.replace("%3Clocale%3E", anchorURLReplace); anchorChild[i].setAttribute('href', anchorChildHREF); } } } </script> <h1 id="fw-pagetitle" class="" data-owner="ID">Telephony Signaling</h1> </div> </div>  <div class="row full visitedlinks"> <div class="col full" > <div class="row wide-narrow" id="birthcert"> <div class="col wide"> <div class="desc-more hide">The human voice generates sound waves, and the telephone converts the sound waves into electrical signals, analogous to sound. Analog signaling is not robust, either because of line noise or inefficient techniques used to reduce line noise. Analog transmissions are boosted by amplifiers because the signal diminishes the farther it travels from the CO. As the signal is boosted, the noise is also boosted, which often causes an unusable connection. <p>In digital networks, signals are transmitted over great distances and coded, regenerated, and decoded without degradation of quality. Repeaters amplify the signal and clean it to its original condition. Repeaters then determine the original sequence of the signal levels and send the clean signal to the next network destination.</p> <p>Voice ports on routers and access servers physically connect the router or access server to telephony devices such as telephones, fax machines, PBXs, and PSTN central office (CO) switches. These devices may use any of several types of signaling interfaces to generate information about on-hook status, ringing, and line seizure.</p></div> <div class="desc-less">The human voice generates sound waves, and the telephone converts the sound waves into electrical signals, analogous to sound. Analog signaling is not robust, either because of line noise or inefficient techniques used to reduce line noise. Analog transmissions are boosted by </div> <button class="readmore">Read more</button> </div> <div class="col narrow"> <button class="subp">Sub-Protocols</button> <ul id="subprotocols" class="cdc-expandPanel"> <li>Q Signaling (QSIG)</li><li>Digital CCS</li><li>Digital CAS</li><li>Analog Signaling (E & M, DID, FXS, FXO)</li><li>Signaling System 7 (SS7)</li> </ul> </div> </div> <script type="text/javascript"> cdc.util.ensureNamespace("cdc.rc.techbc"); cdc.rc.techbc.morebutton = "Read more"; cdc.rc.techbc.lessbutton = "Read less"; </script> </div> </div> <div class="row full visitedlinks"> <div class="col full" > <div id="contactTrans"> <style> /* CAWI-7215 / irregular breakpoints */ @media only screen and (max-width: 430px) { .cdc-support-series .contactUs, .cdc-support-model .contactUs, .cdc-support-technology-series .contactUs, .cdc-support-multimedia-eot .contactUs, .cdc-eot-toc .contactUs{ font-size: 1.4rem; margin-top: -4px; position: relative; display: table; right: -9px; text-align: center; } .cdc-support-series #contactTrans, .cdc-support-model #contactTrans, .cdc-support-technology-series #contactTrans, .cdc-support-multimedia-eot #contactTrans, .cdc-eot-toc #contactTrans { position: relative; width: 100%; height: 40px; border-top: 1px solid #CCCCCC; text-align: right; min-width: 300px; display: flex; justify-content: flex-end; padding-top: 12px; padding-bottom: 12px; } #alertsComp .new { margin-right: 25px; } #alertMessage.show { margin-top: 23px; } .contactUs.open { margin-top: 6px; } .cdc-support-series #smptranslations .lang-list, .cdc-support-model #smptranslations .lang-list, .cdc-support-technology-series #smptranslations { margin-top: 26px; } .cdc-support-series .contactUs button, .cdc-support-model .contactUs button, .cdc-support-technology-series .contactUs button, .cdc-support-multimedia-eot .contactUs button, .cdc-eot-toc .contactUs button { padding: 10px 0; position: relative; top: 0; right: 10px; min-width: min-content; white-space: break-spaces; } } @media only screen and (max-width: 444px) { #alertsComp .new { background-color: #6ebe4a; padding: 0 3px; text-decoration: none!important; border-radius: 13px; color: #fff!important; white-space: nowrap; display: inline-block; font-size: 12px; height: 21px; vertical-align: top; } #alertsComp button { font-size: 1.4rem; padding-right: 20px; vertical-align: sub; white-space: nowrap; position: relative; } #alertsComp { width: 30%; } .cdc-support-series .contactUs, .cdc-support-model .contactUs, .cdc-support-technology-series .contactUs, .cdc-support-multimedia-eot .contactUs, .cdc-eot-toc .contactUs{ width: 30%; top: -3px; } #alertsComp .new { top:3px; position:relative; } .cdc-support-series .contactUs.open, .cdc-support-model .contactUs.open, .cdc-support-technology-series .contactUs.open, .cdc-support-multimedia-eot .contactUs.open, .cdc-eot-toc .contactUs.open { margin-top: -4px; } ul#contactList { right: -60px; top: 56px; } } @media only screen and (min-width: 30em){ #alertsComp .new { top:3px; position:relative; } } @media only screen and (max-width: 64em){ .cdc-support-series .contactUs.open, .cdc-support-model .contactUs.open, .cdc-support-technology-series .contactUs.open, .cdc-support-multimedia-eot .contactUs.open, .cdc-eot-toc .contactUs.open { top: -3px; } } </style> <div class="contactUs"> <button aria-expanded="false" aria-labelledby="Contact Cisco" id="contact-button">Contact Cisco <span class="caret"></span></button> <ul id="contactList" tabindex="-1" aria-labelledby="Contact Cisco"> <li class="button"><a href="https://mycase.cloudapps.cisco.com/case">Open a TAC Case Online</a></li> <li>US/Canada 800-553-2447</li> <li><a href="//www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html">Worldwide Support Phone Numbers</a></li> <li><a href='//www.cisco.com/c/en/us/support/web/tools-catalog.html'>All Tools</a></li> <li id="feedback"><a href='https://ciscocx.qualtrics.com/jfe/form/SV_2gAQDPastWsR6ke?Ref=' + location.href , target="popup" onclick="window.open('https://ciscocx.qualtrics.com/jfe/form/SV_2gAQDPastWsR6ke?Ref=' + location.href + '&resize=false', 'feedback', 'width=650, height=460, scrollbars=1, menubar=1, resizable=1'); return false;"><img id="rr_feedback_img" title="Feedback" src="//www.cisco.com/c/dam/cdc/i/Feedback_OceanBlue.png" alt="Feedback"> Feedback</a></li> </ul> </div>  <script language="javascript"> if (typeof(cdc) == "undefined") cdc={}; if (typeof(cdc.translations) == "undefined") cdc.translations={}; cdc.translations.smp = "SMP"; cdc.translations.map = "{pt-br=https://www.cisco.com/c/pt_br/tech/voice/telephony-signaling/index.html, es-mx=https://www.cisco.com/c/es_mx/tech/voice/telephony-signaling/index.html, ko-kr=https://www.cisco.com/c/ko_kr/tech/voice/telephony-signaling/index.html, ja-jp=https://www.cisco.com/c/ja_jp/tech/voice/telephony-signaling/index.html, de-de=https://www.cisco.com/c/de_de/tech/voice/telephony-signaling/index.html, fr-ca=https://www.cisco.com/c/fr_ca/tech/voice/telephony-signaling/index.html, ar-ae=https://www.cisco.com/c/ar_ae/tech/voice/telephony-signaling/index.html, nl-nl=https://www.cisco.com/c/nl_nl/tech/voice/telephony-signaling/index.html, zh-tw=https://www.cisco.com/c/zh_tw/tech/voice/telephony-signaling/index.html, zh-cn=https://www.cisco.com/c/zh_cn/tech/voice/telephony-signaling/index.html, en-us=https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html, x-default=https://www.cisco.com/c/en/us/tech/voice/telephony-signaling/index.html}";//storing the map for use in the JS cdc.translations.locale="en_us"; </script> <div class="smplangdropdown"> <button type="button" aria-expanded="false" id="smplangbutton" aria-haspopup="true" aria-controls="smptranslations" aria-labelledby="Other Languages"> <span class="smptranslationsIcon"></span> <label class="smpIconLabel">Other Languages</label> </button> <div id="smptranslations" role="dialog" id="dialogt" aria-labelledby="smplangbutton" aria-modal="true" class="default_dialog"> <ul aria-labelleby="Other Languages" id="smplangselector" class="lang-list"></ul> </div> </div> </div> <script type="text/javascript"> if (typeof cdc == "undefined") cdc = {}; if (typeof cdc.rc == "undefined") cdc.rc = {}; if (typeof cdc.rc.cav == "undefined") cdc.rc.cav = {}; cdc.rc.cav.hide = false?false:false; // hide customers also viewed in subtabs if box checked </script> <section id="drawertab" data-owner="ID" > <dl> <dt class="dtname"><button>Documentation</button></dt> <dd id="info-documents" > <div class="row full"> <div class="col full"> <script language="javascript"> if (typeof(cdc) == "undefined") cdc={}; if (typeof(cdc.rc) == "undefined") cdc.rc={}; cdc.rc.concept_name = document.getElementsByName("concept")[0].getAttribute("content"); cdc.rc.locale_info = "en-US";//storing the page locale for use in the JS let localePieces = cdc.rc.locale_info.split("-"); cdc.rc.language = localePieces[0]; cdc.rc.country = localePieces[1]?localePieces[1]:localePieces[0]; // initialize dictionary for i18n cdc.util.ensureNamespace("cdc.rc.bsearch.msgs"); cdc.rc.bsearch.msgs.resultTitle = "Top Search Results"; cdc.rc.bsearch.msgs.altTitle = "Showing English Results"; cdc.rc.bsearch.msgs.noResultTitle = "No results found"; cdc.rc.bsearch.msgs.techError = "Search is currently unavailable due to technical issues. We are working to resolve the problem as quickly as possible."; cdc.rc.bsearch.msgs.noResultMsg = "<div class='search-error'><h2 aria-live=\"polite\" role=\"status\" class='title'>No results found</h2>" + "<div aria-live=\"polite\">We did not find results for: searchstring</div>" + "<div class='suggest'>Suggestions:</div>" + "<ul><li>Check your spelling.</li>" + "<li>Try different keywords.</li>" + "<li>Try more generic keywords.</li></ul></div>"; cdc.rc.bsearch.msgs.loadmore = "Load More"; cdc.rc.bsearch.msgs.closeresults = "Close Results"; </script> <div id="bsearch-wrapper"> <form id="bsearch-form"> <input type="text" id="search-field-srchstr" placeholder="Search This Technology’s Documentation" /> <button class="submit" value="submit" type="submit" aria-label="Submit"><div><img src="/etc/designs/cdc/fw/i/search_icon.png" width="34px" height="34px"></div></button> <button class="clear" value="clear" aria-label="Clear"><div><img src="/etc/designs/cdc/fw/i/clear_search_icon.png" width="20px" height="20px"></div></button> </form> <div id="bsearch-results-wrapper" role="region" aria-label="Search Results"> <div class="expand-panel cdc-expandPanel cdc-expandPanel-visible bsearch-panel" style=""> <div class="spinner" style="text-align: center; padding-top: 69px; padding-bottom: 56px; display: none;"><img src="/etc/designs/cdc/fw/i/spinner.gif"></div> <div id="results-wrapper" role="status"> <h2 class="title">Top Search Results</h2> <div class="results" > </div> </div> <button class="load-more" >Load More</button> <button class="locResults" style="display:none;">View English Results</button> <button class="enResults" style="display:none;">View English Results</button> <button class="extra-close">Close Results<span class="close-caret"></span></button> </div> </div> </div> <script> jQuery(document).ready( function() { if (document.getElementById("bsearch-form") && !cdc.rc.bsearch.hasConfig) { let selectors = {metricsPrefix:"ser", searchForm:"#bsearch-form", resultPanel:"#bsearch-results-wrapper", appName:"cdc_boundsearch_template", searchBoth:true}, fltrqry = [{"items": [{"fieldname": "concept.keyword", "value":cdc.rc.concept_name}, {"fieldname": "secondaryconcept.keyword", "value": cdc.rc.concept_name, "lastval": true}],"last": true}], fltrqryAlt = [{"items": [{"fieldname": "concept.keyword", "value":cdc.rc.concept_name}, {"fieldname": "secondaryconcept.keyword", "value": cdc.rc.concept_name, "lastval": true}],"last": true}], details = { filterQuery:fltrqry, filterQueryAlt:fltrqryAlt, appName:"cdc_boundsearch_template"}; cdc.rc.boundedSearch.init(selectors, details); } var inputEle = document.getElementById('search-field-srchstr'); var isFocused = (document.activeElement === inputEle); if(isFocused) { jQuery('#search-field-srchstr').on("keydown", function(e){ key = e.keyCode; if ( key == 13) { jQuery('#results-wrapper').focus(); } }); } }); </script> </div> </div> <section id="subtabs"> <button><span class="label">use JS to put chosen tab in here or hide</span><span class="caret"></span></button> <ul role="tablist" > <li role="presentation"><button role="tab" aria-controls="stc0" aria-label='Key Information' id="subtab0" data-config-metrics-item="Key Information">Key Information</button> </li> <li role="presentation"><button role="tab" aria-controls="stc1" aria-label='Customers Also Viewed' id="subtab1" data-config-metrics-item="Customers Also Viewed">Customers Also Viewed</button> </li> <li role="presentation"><button role="tab" aria-controls="stc2" aria-label='Saved Content' id="subtab2" data-config-metrics-item="Saved Content">Saved Content</button> </li> </ul> <div id="stc0" role="tabpanel" tabindex="0" aria-labelledby="subtab0" > <div class="keyInformation"> <h3>Key Information</h3> <ul > </ul> </div> </div> <div id="stc1" role="tabpanel" tabindex="0" aria-labelledby="subtab1" > <div class= "series-model-vav"> <h3>Customers Also Viewed </h3> <ul> </ul> </div> </div> <div id="stc2" role="tabpanel" tabindex="0" aria-labelledby="subtab2" > <div class= "series-model-saved-content"> <h3>Saved Content </h3> <ul> <li> <div class="login-msg"> <span>You can now save documents for easier access and future use. Saved documents for this product will be listed here, or visit the <a href="/c/en/us/support/saved/index.html">My Saved Content</a> page to view and manage all saved content from across Cisco.com. </span> <br><br> <span> <a href="/c/login/index.html?referer=/c/en/us/tech/voice/telephony-signaling/index.html">Log in</a> to see your Saved Content. </span> </div> </li> </ul> </div> </div> </section> <div class="row full"> <div class="col"> <script src="/etc/designs/cdc/fw/clientlibs/granite-utils.min.js"></script> <script src="/etc/designs/cdc/fw/clientlibs/editbase_overrides.min.js"></script> <script type="text/javascript"> if (typeof(cdc) == "undefined") cdc={}; if (typeof(cdc.rc) == "undefined") cdc.rc={}; cdc.rc.mostRecent = "Most Recent"; </script>  <div class="documents-container"> <div id="actual-document-listings" class="more-documents"> <ul class="group"> <li><a name="Design" id="Design"></a> <h3>Design</h3> <ul class='doc-sublist'> <h4>Design TechNotes</h4> <li> <h4>Digital CAS</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/voice/digital-cas/53049-e1-r2-cookbook.html' data-recentlyviewed='stdLink'>Country Options Configuration for E1R2 Signaling </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> </ul> </li> </ul> </li> <li><a name="Configuration" id="Configuration"></a> <h3>Configuration</h3> <ul class='doc-sublist'> <h4>Configuration Examples and TechNotes</h4> <li> <h4>Applicable to Multiple Technologies</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/voice/digital-cas/27789-Drop-Insert.html' data-recentlyviewed='stdLink'>Integrating PBXs into VoIP Networks Using the TDM Cross Connect Feature </a><span class='most_recent_link_date' style='display:none'>18-Apr-2008</span></li> </ul> </li> <li> <h4>Analog Signaling (E & M, DID, FXS, FXO)</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/213857-configure-land-mobile-radio-lmr-hoot.html' data-recentlyviewed='stdLink'>Configure Land Mobile Radio (LMR) / Hoot and Holler Over IP on IOS-XE Voice Gateways </a><span class='most_recent_link_date' style='display:none'>29-Apr-2022</span></li> <li><a href='/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/23444-callerid-name-del.html' data-recentlyviewed='stdLink'>Caller ID Name Delivery Issues on Cisco IOS Gateways </a><span class='most_recent_link_date' style='display:none'>02-Jul-2007</span></li> <li><a href='/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/27627-e-mpaging.html' data-recentlyviewed='stdLink'>Using Analogue E&M Ports to Interface to Overhead Paging Systems </a><span class='most_recent_link_date' style='display:none'>10-Nov-2006</span></li> <li><a href='/c/en/us/support/docs/voice/media-gateway-control-protocol-mgcp/40300-mgcp-fxs-hookflash-transfer.html' data-recentlyviewed='stdLink'>Hookflash Transfer in MGCP </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> <li><a href='/c/en/us/support/docs/voice/h323/15405-pbx-across-ip.html' data-recentlyviewed='stdLink'>Configuring Hookflash Relay on FXS/FXO Voice Ports </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> </ul> </li> <li> <h4>Digital CAS</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/voice/digital-cas/14078-voip-cas.html' data-recentlyviewed='stdLink'>VoIP with Channel Associated Signaling (CAS) </a><span class='most_recent_link_date' style='display:none'>13-Nov-2006</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/24642-cas-config.html' data-recentlyviewed='stdLink'>Configuring and Troubleshooting T1 CAS Signaling </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/53049-e1-r2-cookbook.html' data-recentlyviewed='stdLink'>Country Options Configuration for E1R2 Signaling </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/12154-e1r2config.html' data-recentlyviewed='stdLink'>E1 R2 Signaling Configuration and Troubleshooting </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> </ul> </li> <li> <h4>Digital CCS</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/voice/digital-ccs/14079-voip-ccs.html' data-recentlyviewed='stdLink'>VoIP with Common Channel Signaling (CCS) </a><span class='most_recent_link_date' style='display:none'>20-Nov-2006</span></li> <li><a href='/c/en/us/support/docs/voice/digital-ccs/24644-tdm-switching.html' data-recentlyviewed='stdLink'>TDM Switching of Voice and Data Calls on AS5400 Gateways Configuration Example </a><span class='most_recent_link_date' style='display:none'>20-Aug-2006</span></li> <li><a href='/c/en/us/support/docs/voice/digital-ccs/15415-bri-voice-port-cfg.html' data-recentlyviewed='stdLink'>Configuring Network Side ISDN BRI Voice Interface Cards </a><span class='most_recent_link_date' style='display:none'>31-Jan-2006</span></li> </ul> </li> <li> <h4>Signaling System 7 (SS7)</h4> <ul class='doc-sublist'> <li><a href='/c/en/us/support/docs/voice-unified-communications/sc-2200-signaling-controller/47400-add-eth-int-pgw.html' data-recentlyviewed='stdLink'>Add Additional Ethernet Interfaces on the PGW Platform </a><span class='most_recent_link_date' style='display:none'>04-Dec-2006</span></li> <li><a href='/c/en/us/support/docs/voice/signaling-system-7-ss7/47722-pgw2200-multi-opc.html' data-recentlyviewed='stdLink'>PGW 2200 Multiple Originating Point Codes Configuration Example </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> <li><a href='/c/en/us/support/docs/voice-unified-communications/sc-2200-signaling-controller/60061-pgw2200-slt-c26xx.html' data-recentlyviewed='stdLink'>PGW 2200 Softswitch: SLT 26xx Configuration </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> </ul> </li> <li><a href='/c/en/us/support/docs/voice/telephony-signaling/212102-Configure-Persistent-Logging-on-Cisco-IO.html' data-recentlyviewed='stdLink'>Configure Persistent Logging on IOS Platforms </a><span class='most_recent_link_date' style='display:none'>24-May-2024</span></li> <li><a href='/c/en/us/support/docs/voice/h323/8746-pbx-samp-cfg.html' data-recentlyviewed='stdLink'>Nortel PBX Option 11 E&M Trunk Card Configuration Example </a><span class='most_recent_link_date' style='display:none'>02-Feb-2006</span></li> </ul> </li> <li><a name="OperationandTroubleshooting" id="OperationandTroubleshooting"></a> <h3>Operation and Troubleshooting</h3> <ul class='doc-sublist'> <h4>Troubleshooting TechNotes</h4> <li><a href='/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/214636-troubleshoot-and-monitor-analog-ports.html' data-recentlyviewed='stdLink'>Troubleshoot and Monitor Analog Ports </a><span class='most_recent_link_date' style='display:none'>20-Aug-2024</span></li> <li><a href='/c/en/us/support/docs/voice/digital-ccs/7960-2isdn-bri-vic.html' data-recentlyviewed='stdLink'>Understanding ISDN BRI Voice Interface Cards </a><span class='most_recent_link_date' style='display:none'>13-Feb-2019</span></li> <li><a href='/c/dam/en/us/support/docs/voice/digital-cas/19066-dsp-trbl-01.pdf' data-recentlyviewed='pdf'>Troubleshooting the DSP on NM-HDV for Cisco 2600/3600/VG200 Series Routers </a><span class='most_recent_link_date' style='display:none'>22-Sep-2014</span> <span class='is-new-link'>(PDF - 129 KB)</span></li> <li><a href='/c/en/us/support/docs/voice/digital-ccs/19087-trans-channel-signal.html' data-recentlyviewed='stdLink'>Configuring and Troubleshooting Transparent CCS </a><span class='most_recent_link_date' style='display:none'>28-Jun-2012</span></li> <li><a href='/c/en/us/support/docs/voice-unified-communications/sc-2200-signaling-controller/48515-pgw-cause-code.html' data-recentlyviewed='stdLink'>Cisco PGW 2200 Softswitch - Cause Code Modification </a><span class='most_recent_link_date' style='display:none'>21-Apr-2009</span></li> <li><a href='/c/en/us/support/docs/voice/voice-quality/109469-dspware-c5510dsp.html' data-recentlyviewed='stdLink'>Identify, Supersede, and Maintain Compatible DSP Firmware Version Levels on C5510 DSPs </a><span class='most_recent_link_date' style='display:none'>23-Feb-2009</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/14007-net-signal-control.html' data-recentlyviewed='stdLink'>Voice Network Signaling and Control </a><span class='most_recent_link_date' style='display:none'>04-Dec-2008</span></li> <li><a href='/c/en/us/support/docs/switches/catalyst-6000-series-switches/8010-6624-fxs.html' data-recentlyviewed='stdLink'>WS-X6624-FXS: 24-Port FXS Blade for Catalyst 6000 Series Switches </a><span class='most_recent_link_date' style='display:none'>22-Oct-2008</span></li> <li><a href='/c/en/us/support/docs/voice-unified-communications/pgw-2200-softswitch/61183-pgw2200-tcap-ts.html' data-recentlyviewed='stdLink'>PGW 2200 Softswitch TCAP Release 9.3 and Later </a><span class='most_recent_link_date' style='display:none'>23-Jul-2008</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/19066-dsp-trbl.html' data-recentlyviewed='stdLink'>Troubleshooting the DSP on NM-HDV for Cisco 2600/3600/VG200 Series Routers </a><span class='most_recent_link_date' style='display:none'>15-Jan-2008</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/18959-em-park-digital-cas.html' data-recentlyviewed='stdLink'>Troubleshooting EM_PARK Issues for E&M Digital CAS Signaling </a><span class='most_recent_link_date' style='display:none'>10-May-2007</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/71708-ios-gwy-mx-alliance.html' data-recentlyviewed='stdLink'>Integrate the Cisco IOS Gateway to the MX/Alliance Turret via T1-CAS </a><span class='most_recent_link_date' style='display:none'>23-Jan-2007</span></li> <li><a href='/c/en/us/support/docs/voice/digital-cas/22444-t1-cas-ios.html' data-recentlyviewed='stdLink'>Understanding How Digital T1 CAS (Robbed Bit Signaling) Works in IOS Gateways </a><span class='most_recent_link_date' style='display:none'>17-Jan-2007</span></li> <li><a href='/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/7938-2fxs-vic.html' data-recentlyviewed='stdLink'>Understanding Foreign Exchange Station (FXS) Voice Interface Cards </a><span class='most_recent_link_date' style='display:none'>20-Nov-2006</span></li> <li><a href='/c/en/us/support/docs/routers/2600-series-multiservice-platforms/15268-vic-2did.html' data-recentlyviewed='stdLink'>Understanding Direct Inward Dial (DID) Voice Interface Cards </a><span class='most_recent_link_date' style='display:none'>08-Oct-2006</span></li> </ul> <a href="/c/en/us/tech/voice/telephony-signaling/tsd-technology-support-troubleshooting-technotes-list.html" class="lll-link">View all documentation of this type<span></span> </a> </li> </ul> </div> <a name="documentsBottom"></a> </div>  </div> </div> </dd> <dt class="dtname"><button>Community</button></dt> <dd id="info-community" > <div class="communityseries" > <nav class="community-links"> <ul>  <li><a href="https://community.cisco.com/t5/technology-and-support/ct-p/technology-support">Cisco Community Home</a></li>  <li><a href="//supportforums.cisco.com/node/add/discussion" class="start-a-discussion">Ask a Question<img alt="login required" src="/etc/designs/cdc/fw/i/icon_lock_small.png"></a></li> </ul> </nav> <ul aria-expanded="false" class="board_selector"> <li class="initial"> <button value="">Select a Community Board</button> <button value=""><p class="reset">Reset</p></button> </li> </ul> <div id="community-results"> <div class="community-latest" > <h2><button><span >Latest Community Activity For This Technology</span ></button></h2>  </div> <div class="community-solved" > <h2><button><span >Solved Issues</span ></button></h2>  </div> <div class="community-documents" > <h2><button><span >Community Documents</span ></button></h2>  </div> </div>  </div> <script type="text/javascript"> cdc.util.ensureNamespace("cdc.rc.series.communitymsgs"); cdc.rc.series.communitymsgs = { day : "1 day ago", days : "$# days ago", week : "1 week ago", weeks : "$# weeks ago", month : "1 month ago", months : "$# months ago", year : "1 year ago", years : "$# years ago", noResults: "There were no Community results for this topic. Please try visiting the <a href=\"$URL\">Cisco Community homepage</a>.", techError: "There was a technical issue with the Communities feed. Please try visiting the <a href=\"$URL\">Cisco Community homepage</a>.", communityHome: "https://community.cisco.com/t5/technology-and-support/ct-p/technology-support", viewLatest: "View Older Discussions", viewSolved: "View All Solved Discussions", viewAll: "View All Community Documents", noResultsBoard: "There are no community discussions for this board.", noSolvedResultsBoard: "There are no solved issues for this board.", noDocsResultsBoard: "There are no community documents for this board." }; </script> <script type="text\html" id="jstemplatedata"> <li> <% if (section == "video"){ %> <a href="${url}">${icon_type}</a> <% } else { %> ${icon_type} <% } %> <div> <a href="${url}" class="title">${title}</a> <% if(teaser && teaser != ""){%> <p class="description">${teaser}</p> <% } %> <span class="community">in <a href="${cscboardhref}">${cscboardtitle}</a></span><span class="author">${cscauthor}</span> <span class="post-date">${created_in}</span> <% if (section == "disc" && issolved) { %> <span class="modified-date">Last Replied ${modified_in}</span> <% } else if (section != "video"){ %> <span class="modified-date">Last modified: ${modified_in}</span> <%}%> </div> </li> </script> </dd> </dl> </section> </div> </div>   </div> <script type="module" src="/site/web-components/us/en/cdc-footer.js"></script> <cdc-footer></cdc-footer> <script type="text/javascript"> if(document.querySelector('#privacy-manager')!=null){ document.querySelector('#privacy-manager').href='#cookies'; } </script> <div id="fw-overlay"></div> <script src="/etc/designs/cdc/clientlibs/responsive/js/responsive.min.js"></script> <script src="/etc/designs/cdc/fw/m/support_technology_series_metrics_rules.js" type="text/javascript"></script> <script src="/etc/designs/cdc/fw/lib/jqmodal.js" type="text/javascript"></script>  <noscript><img src="//cisco.112.2o7.net/b/ss/cisco-mobile/5/12345" width="2" height="2" border="0" alt=""/></noscript> </body> </html>

CINXE.COM

Telephony Signaling - Cisco