{"id":14710,"date":"2025-10-09T22:52:35","date_gmt":"2025-10-09T22:52:35","guid":{"rendered":"https:\/\/voice.ai\/hub\/?p=14710"},"modified":"2025-10-13T11:00:23","modified_gmt":"2025-10-13T11:00:23","slug":"ccxml","status":"publish","type":"post","link":"https:\/\/voice.ai\/hub\/ai-voice-agents\/ccxml\/","title":{"rendered":"What Is CCXML? Complete Guide to Call Control Solutions"},"content":{"rendered":"\n<p>Ever been trapped in an IVR loop when a quick transfer or conference would have solved the call? Call centers require robust call control and session management to automate call routing, transfers, conferencing, and event handling, ensuring calls operate smoothly without human intervention. Whether you&#8217;re integrating with an existing <a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/ivr-platform\/\" target=\"_blank\" rel=\"noreferrer noopener\">IVR platform<\/a> or building one from scratch, CCXML, the call control XML standard, enables you to script call flows, manage call state, control SIP and PSTN sessions, and connect voice applications with your telephony server. This article provides clear examples and practical steps to acquire the knowledge and tools necessary to build efficient automated voice systems that seamlessly manage and control calls without requiring manual intervention.<br><br>Voice AI&#8217;s <a href=\"https:\/\/voice.ai\/text-to-speech\/\" target=\"_blank\" rel=\"noreferrer noopener\">text-to-speech tool<\/a> helps you reach that goal by converting call scripts into natural-sounding prompts and dynamic messages that integrate seamlessly into CCXML call flows, enhancing the caller experience while maintaining reliable automation. No deep signal processing knowledge required; you can test prompts and deploy to contact center servers quickly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is CCXML?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"464\" src=\"https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-132-1024x464.png\" alt=\"woman at a call center - Call center automation\" class=\"wp-image-14712\" srcset=\"https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-132-1024x464.png 1024w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-132-300x136.png 300w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-132-768x348.png 768w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-132.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Short for Call Control eXtensible Markup Language, CCXML is an XML-based language created to <a href=\"https:\/\/www.networkworld.com\/article\/828893\/tech-primers-understanding-ccxml-standard.html?\" target=\"_blank\" rel=\"noreferrer noopener\">handle telephony call control<\/a>. It tells a telephony platform how to set up, monitor, and tear down phone calls. CCXML controls signaling, call legs, trunks, and media connections, while a separate VoiceXML interpreter handles the spoken dialog and interactive voice response flows.&nbsp;<\/p>\n\n\n\n<p>You can use CCXML to initiate:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Outbound calls<\/li>\n\n\n\n<li>Bridge calls into conferences<\/li>\n\n\n\n<li>Transfer calls&nbsp;<\/li>\n\n\n\n<li>Manage complex call routing<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">How CCXML and VoiceXML Work Together<\/h3>\n\n\n\n<p>CCXML manages call control logic and lifecycle events while VoiceXML handles the voice interaction with the caller. A single incoming call can spawn a CCXML session that creates a dedicated VoiceXML interpreter for that call.&nbsp;<\/p>\n\n\n\n<p>That separation keeps the call control code lightweight and focused on SIP, PSTN, and RTP operations, while keeping the dialog code concentrated on:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prompts<\/li>\n\n\n\n<li>Grammars<\/li>\n\n\n\n<li>User input<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Where CCXML Came From and Its Standards Status<\/h3>\n\n\n\n<p>The World Wide Web Consortium W3C developed CCXML as a standard to extend VoiceXML with robust call control. The spec began in the early 2000s and has evolved through revisions and drafts since then.&nbsp;<\/p>\n\n\n\n<p>CCXML is still <a href=\"https:\/\/en.wikipedia.org\/wiki\/Call_Control_eXtensible_Markup_Language?\" target=\"_blank\" rel=\"noreferrer noopener\">treated like a mature proposal<\/a>, with updates and implementations following the W3C work and vendor contributions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Core CCXML Capabilities Every Developer Should Know<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.speechtechmag.com\/Articles\/Columns\/Standards\/CCXML-A-Standard-for-Managing-Calls-52490.aspx?\" target=\"_blank\" rel=\"noreferrer noopener\">CCXML supports<\/a>:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Multi-party conferencing<\/li>\n\n\n\n<li>Call transfer<\/li>\n\n\n\n<li>Call bridging<\/li>\n<\/ul>\n\n\n\n<p>It can make outgoing calls and manage multiple call legs for features such as callback or warm transfer.&nbsp;<\/p>\n\n\n\n<p>It exposes events for asynchronous processing:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Call state changes<\/li>\n\n\n\n<li>Media events<\/li>\n\n\n\n<li>Message parsing<\/li>\n\n\n\n<li>External messages<\/li>\n<\/ul>\n\n\n\n<p>CCXML apps can create and control:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Conference objects<\/li>\n\n\n\n<li>Manage audio and DTMF routing<\/li>\n\n\n\n<li>Dynamically manipulate media streams<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">How CCXML Improves Contact Center Customer Experience<\/h3>\n\n\n\n<p>Contact centers utilize CCXML to develop reliable and predictable telephony features.&nbsp;<\/p>\n\n\n\n<p>It enables:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Skills-based routing<\/li>\n\n\n\n<li>ACD queue management<\/li>\n\n\n\n<li>Callback via outbound call generation<\/li>\n\n\n\n<li>Dynamic agent routing based on presence<\/li>\n<\/ul>\n\n\n\n<p>That reduces wait times and failed transfers, and keeps agent workflows simple by centralizing call control logic in the telephony layer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How CCXML Works in Practice: Sessions, Documents, and Events<\/h3>\n\n\n\n<p>A CCXML application is a set of documents. A running application instance is a Session that can span multiple calls and multiple CCXML documents.&nbsp;<\/p>\n\n\n\n<p>The CCXML engine receives asynchronous events from the network or media server and triggers handlers that create:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connections<\/li>\n\n\n\n<li>Conferences<\/li>\n\n\n\n<li>Media controls<\/li>\n<\/ul>\n\n\n\n<p>The engine talks SIP for signaling and RTP for media, and it can interact with external services through HTTP and CGI interfaces.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Example Scenario: Route Calls Based on Agent Availability<\/h3>\n\n\n\n<p>Imagine an inbound call reaches your SIP trunk. CCXML receives the incoming call event and queries an agent presence service or ACD via HTTP. If Agent A is available, CCXML opens a connection to Agent A and attaches a <a href=\"https:\/\/www.w3.org\/TR\/ccxml\/?\" target=\"_blank\" rel=\"noreferrer noopener\">VoiceXML interpreter to play<\/a> the IVR prompts and collect input.&nbsp;<\/p>\n\n\n\n<p>If Agent A is busy, CCXML checks the skill groups and places the call in a queue, or creates a conference bridge while dialing an available backup agent. If no agent answers, CCXML can schedule a callback by initiating an outbound call when an agent becomes free. This keeps the call routing decision logic in CCXML and leaves the caller experience to VoiceXML.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Advanced Telephony Functions and Event Handling<\/h3>\n\n\n\n<p>CCXML supports <a href=\"https:\/\/www.networkworld.com\/article\/828893\/tech-primers-understanding-ccxml-standard.html?\" target=\"_blank\" rel=\"noreferrer noopener\">asynchronous events<\/a> for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Signaling<\/li>\n\n\n\n<li>Media<\/li>\n\n\n\n<li>External messages<\/li>\n<\/ul>\n\n\n\n<p>That includes:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Message parsing<\/li>\n\n\n\n<li>Status events for:\n<ul class=\"wp-block-list\">\n<li>Calls<\/li>\n\n\n\n<li>Alarms<\/li>\n\n\n\n<li>User-defined events from third-party systems<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>You can program event handlers to react to early media, call failures, or changes in agent state. The model enables concurrent operations, such as dialing a callback, while maintaining an existing call leg.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Standard Protocols and Integration Points<\/h3>\n\n\n\n<p>CCXML implementations typically work with SIP for call signaling and RTP for media streams.&nbsp;<\/p>\n\n\n\n<p>They integrate with:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PSTN gateways<\/li>\n\n\n\n<li>SIP trunks<\/li>\n\n\n\n<li>Media servers<\/li>\n<\/ul>\n\n\n\n<p>CCXML often coexists with telephony APIs, CTI systems, and enterprise suites from vendors such as:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avaya<\/li>\n\n\n\n<li>Blueworx<\/li>\n\n\n\n<li>SAP<\/li>\n<\/ul>\n\n\n\n<p>You can also connect CCXML to WebRTC gateways, databases, and REST services for presence and CRM lookups.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Platforms, Engines, and Developer Tooling<\/h3>\n\n\n\n<p>You can build CCXML applications using general programming languages like Java or with vendor platforms and open-source engines. Oktopus is one example of an open CCXML engine.&nbsp;<\/p>\n\n\n\n<p>Many vendors embed CCXML support in their media servers and contact center platforms. Use a CCXML engine that supports CGI or HTTP callbacks, allowing your application logic to run on a standard web server.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Practical Tips for Building IVR and Call Control Apps<\/h3>\n\n\n\n<p>Start by separating call control from voice dialog: keep CCXML focused on call routing, conference control, and session management while VoiceXML handles prompts and grammars. Test call flows against SIP trunks and media servers to validate early media and DTMF handling.&nbsp;<\/p>\n\n\n\n<p>Embrace asynchronous event testing and simulate agent state changes so your routing logic behaves under load. Monitor call state and logs generated by the CCXML engine, as well as instrument HTTP endpoints, for visibility into routing decisions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When to Use CCXML Versus Other Telephony Tools<\/h3>\n\n\n\n<p>Use CCXML when you need:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fine-grained control of call setup<\/li>\n\n\n\n<li>Multi-leg dialing<\/li>\n\n\n\n<li>Conferencing<\/li>\n\n\n\n<li>Asynchronous call events<\/li>\n<\/ul>\n\n\n\n<p>If your project involves only simple IVR prompts and data collection, VoiceXML may suffice on its own.<\/p>\n\n\n\n<p>Add CCXML to your architecture to keep telephony logic centralized and consistent when you require:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Outbound dialing<\/li>\n\n\n\n<li>Callback orchestration<\/li>\n\n\n\n<li>Tight integration with ACD and CTI systems<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Questions to Consider Before Designing a CCXML Solution<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Which media server and SIP trunk will you use?&nbsp;<\/li>\n\n\n\n<li>How will you expose agent presence and ACD data to CCXML?&nbsp;<\/li>\n\n\n\n<li>Do you need multi-party conferencing or just basic transfer and queuing?&nbsp;<\/li>\n\n\n\n<li>How will you monitor events and errors from the CCXML engine?&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>Answering these helps define the CCXML session model and the integration points you will implement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Related Reading<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/voice.ai\/hub\/tts\/biz360\/\" target=\"_blank\" rel=\"noreferrer noopener\">Biz360<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/tts\/aircall-alternatives\/\">Aircall Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/tts\/call-routing-services\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Routing Services<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/tts\/cloudtalk-competitors\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cloudtalk Competitors<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/tts\/Dialpad-AI-Voice\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dialpad AI Voice<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/five9-competitors\/\" target=\"_blank\" rel=\"noreferrer noopener\">Five9 Competitors<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/dialpad-competitors\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dialpad Competitors<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/five9-alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">Five9 Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/how-artificial-intelligence-is-transforming-contact-centers\/\" target=\"_blank\" rel=\"noreferrer noopener\">How Artificial Intelligence Is Transforming Contact Centers<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/genesys-alternative\/\" target=\"_blank\" rel=\"noreferrer noopener\">Genesys Alternative<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/ivr-service-provider\/\" target=\"_blank\" rel=\"noreferrer noopener\">IVR Service Provider<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/nextiva-alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nextiva Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/multi-level-ivr\/\" target=\"_blank\" rel=\"noreferrer noopener\">Multi Level IVR<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/justcall-alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">JustCall Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/nice-competitors\/\" target=\"_blank\" rel=\"noreferrer noopener\">NICE Competitors<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/openphone-alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">Open Phone Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/nuance-ivr\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nuance IVR<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/openphone-or-mightycall\/\" target=\"_blank\" rel=\"noreferrer noopener\">OpenPhone or MightyCall<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/open-phone-alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">OpenPhone Alternatives<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What\u2019s the Difference Between CCXML vs. VXML?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-133-1024x576.png\" alt=\"call center agent - Call center automation\" class=\"wp-image-14713\" srcset=\"https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-133-1024x576.png 1024w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-133-300x169.png 300w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-133-768x432.png 768w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-133-1536x864.png 1536w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/image-133.png 1921w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.apa.org\/news\/podcasts\/speaking-of-psychology\/noisy-world?\" target=\"_blank\" rel=\"noreferrer noopener\">More channels exist now<\/a>, but people pick up the phone when they want clear answers fast, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Email<\/li>\n\n\n\n<li>Social media<\/li>\n\n\n\n<li>Chat<\/li>\n<\/ul>\n\n\n\n<p>Zendesk finds that more than half of your customers, regardless of age, will use the phone to reach a service team.&nbsp;<\/p>\n\n\n\n<p>That fact pushes contact centers to invest in telephony channels, interactive tools, and rich voice experiences that integrate with:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CRM<\/li>\n\n\n\n<li>Analytics<\/li>\n\n\n\n<li>Workforce systems<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Origins And Versions: Who Built These Standards And When<\/h3>\n\n\n\n<p>VoiceXML appeared first. The VoiceXML Forum was formed in 1999 and released early specs the same year. VXML evolved through various versions and currently sits at a modern 3.x release, which is used by voice browsers today.&nbsp;<\/p>\n\n\n\n<p>CCXML came later as a complementary standard. W3C published CCXML 1.0 as a recommendation in July 2011. Vendors like Avaya and IBM added support and toolkits, and CCXML implementations then found their way into contact center platforms and telephony servers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What VXML Does: The Dialogue Director<\/h3>\n\n\n\n<p>VoiceXML handles the <a href=\"https:\/\/www.w3.org\/Voice\/2006\/voicexml3.pdf?\" target=\"_blank\" rel=\"noreferrer noopener\">call content<\/a>.&nbsp;<\/p>\n\n\n\n<p>It defines:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prompts<\/li>\n\n\n\n<li>Menus<\/li>\n\n\n\n<li>Speech recognition grammars<\/li>\n\n\n\n<li>DTMF handling<\/li>\n\n\n\n<li>Text-to-speech<\/li>\n\n\n\n<li>Input forms<\/li>\n\n\n\n<li>Dialog flow<\/li>\n<\/ul>\n\n\n\n<p>A voice browser interprets VXML pages and interacts with the user over PSTN or SIP. Build your IVR trees, authentication prompts, self-service menus, and dynamic prompts with VXML.&nbsp;<\/p>\n\n\n\n<p>Think of VXML as the script that:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Speaks<\/li>\n\n\n\n<li>Listens<\/li>\n\n\n\n<li>Gathers data from callers<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">What CCXML Does: The Call Control Conductor<\/h3>\n\n\n\n<p>CCXML handles call control logic and telephony events.&nbsp;<\/p>\n\n\n\n<p>It manages incoming and outgoing:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Call sessions<\/li>\n\n\n\n<li>Call routing<\/li>\n\n\n\n<li>Call transfer<\/li>\n\n\n\n<li>Hold and resume<\/li>\n\n\n\n<li>Conferencing<\/li>\n\n\n\n<li>Call bridging<\/li>\n\n\n\n<li>Parallel forking<\/li>\n\n\n\n<li>Session management<\/li>\n<\/ul>\n\n\n\n<p>CCXML reacts to telephony events, invokes call control actions, and integrates with systems:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SIP<\/li>\n\n\n\n<li>PSTN<\/li>\n\n\n\n<li>ACD<\/li>\n\n\n\n<li>PBX&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>Use CCXML documents and event handlers to orchestrate who is on the line and where media flows, while the voice browser focuses on the spoken dialog.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How They Complement Each Other: Who Decides What Happens And What Is Said<\/h3>\n\n\n\n<p>Which one controls the call, and which one handles the speech? <a href=\"https:\/\/www.site.uottawa.ca\/~damyot\/pub\/CCNC07-Amyot.pdf?\" target=\"_blank\" rel=\"noreferrer noopener\">CCXML decides what happens<\/a> to the call. VXML decides what is said during the call.&nbsp;<\/p>\n\n\n\n<p>A typical flow:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CCXML answers the call<\/li>\n\n\n\n<li>Inspects the caller ID or SIP headers<\/li>\n\n\n\n<li>Routes the session to a VXML server for dialog<\/li>\n<\/ul>\n\n\n\n<p>If necessary, the flow utilizes CCXML to place the:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Caller on hold<\/li>\n\n\n\n<li>Create a conference<\/li>\n\n\n\n<li>Transfer the session to an agent<\/li>\n<\/ul>\n\n\n\n<p>In practice, the two run together: CCXML serves as a call router and session manager, while VXML acts as a script director and dialog engine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A Short Analogy And An Example You Can Picture<\/h3>\n\n\n\n<p>Think of CCXML as a call router standing at a switchboard and VXML as the director on a stage.&nbsp;<\/p>\n\n\n\n<p>The router:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Plugs lines together<\/li>\n\n\n\n<li>Moves people between rooms<\/li>\n\n\n\n<li>Sets up the stage<\/li>\n<\/ul>\n\n\n\n<p>The director:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Writes the lines<\/li>\n\n\n\n<li>Cues the actors<\/li>\n\n\n\n<li>Runs the dialogue<\/li>\n<\/ul>\n\n\n\n<p>Example: a customer calls. CCXML routes the call to a VXML app that prompts for the account number and verifies identity. CCXML then opens a conference and merges the agent with the caller when the agent accepts the transfer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Practical Deployment Differences And Tooling<\/h3>\n\n\n\n<p>VXML enjoys broader open-source support and numerous voice browsers. CCXML implementations are <a href=\"https:\/\/www.w3.org\/TR\/ccxml\/?\" target=\"_blank\" rel=\"noreferrer noopener\">often found within contact<\/a> center platforms, telephony servers, or commercial stacks from vendors such as Avaya and Genesys. You can run VXML on standalone voice browsers or cloud IVR services.&nbsp;<\/p>\n\n\n\n<p>For CCXML, you typically lean on a telephony platform that exposes a:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CCXML interpreter<\/li>\n\n\n\n<li>Telephony API<\/li>\n\n\n\n<li>SIP integration<\/li>\n\n\n\n<li>ACD hooks<\/li>\n\n\n\n<li>CTI links<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Who Handles Common Call Tasks: A Quick Reference<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VXML:\n<ul class=\"wp-block-list\">\n<li>Authentication prompts<\/li>\n\n\n\n<li>Speech recognition<\/li>\n\n\n\n<li>Menu logic<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>CCXML:\n<ul class=\"wp-block-list\">\n<li>Put on hold<\/li>\n\n\n\n<li>Call transfer<\/li>\n\n\n\n<li>Blind and attended transfers<\/li>\n\n\n\n<li>Call:\n<ul class=\"wp-block-list\">\n<li>Recording<\/li>\n\n\n\n<li>Control<\/li>\n\n\n\n<li>Monitoring<\/li>\n\n\n\n<li>Conferencing&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>CCXML:\n<ul class=\"wp-block-list\">\n<li>Outbound call control&nbsp;<\/li>\n\n\n\n<li>Parallel device forking<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>VXML:\n<ul class=\"wp-block-list\">\n<li>Media prompts<\/li>\n\n\n\n<li>Barge in<\/li>\n\n\n\n<li>Reprompt<\/li>\n\n\n\n<li>Slot filling<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>CCXML:\n<ul class=\"wp-block-list\">\n<li>Session state<\/li>\n\n\n\n<li>Telephony event handling<\/li>\n\n\n\n<li>Interaction with PBX or SIP trunking<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Technical Features To Watch For When Designing Systems<\/h3>\n\n\n\n<p>Look for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CCXML support for event handling<\/li>\n\n\n\n<li>Call session management<\/li>\n\n\n\n<li>Call state transitions<\/li>\n\n\n\n<li>SIP integration<\/li>\n\n\n\n<li>Call routing logic<\/li>\n\n\n\n<li>Conference control<\/li>\n\n\n\n<li>Media control commands<\/li>\n<\/ul>\n\n\n\n<p>On the VXML side, check for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Speech recognition engines<\/li>\n\n\n\n<li>Grammar formats<\/li>\n\n\n\n<li>TTS quality<\/li>\n\n\n\n<li>Voice browser compatibility<\/li>\n\n\n\n<li>HTTP integration for backend data<\/li>\n<\/ul>\n\n\n\n<p>Plan how your contact center platform handles CCXML documents, CCXML interpreter behavior, and how it hands off to VXML voice browsers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Questions To Ask Before You Design Or Buy<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do you require advanced call control features such as conferencing, parallel ringing, or outbound dialing?\n<ul class=\"wp-block-list\">\n<li>If yes, you will need a mature CCXML capability or vendor API.&nbsp;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Will your IVR require complex speech dialogs and multi-turn forms?\n<ul class=\"wp-block-list\">\n<li>Then focus on VXML voice browser support and speech engine quality.&nbsp;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>How will CCXML and VXML share context, variables, and call metadata between the call control layer and the dialog layer?<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Simple Advice On Building Robust Call Flows<\/h3>\n\n\n\n<p>Separate responsibilities. Keep call control logic in CCXML or the telephony layer. Keep dialog flow, prompts, and recognition in VXML.&nbsp;<\/p>\n\n\n\n<p>Use explicit session handoffs, pass caller state via session variables or HTTP endpoints, and test event handling for edge cases, such as:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mid-call offers<\/li>\n\n\n\n<li>Unexpected transfers<\/li>\n\n\n\n<li>Dropped media<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Related Reading<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/ringcentral-alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">RingCentral Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/Smart-IVR\/\" target=\"_blank\" rel=\"noreferrer noopener\">Smart IVR<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/Talkdesk-Alternative\/\" target=\"_blank\" rel=\"noreferrer noopener\">Talkdesk Alternative<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/Talkdesk-Studio\/\" target=\"_blank\" rel=\"noreferrer noopener\">Talkdesk Studio<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/Talkroute-Alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">Talkroute Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/Voice-Bot-Solutions\/\" target=\"_blank\" rel=\"noreferrer noopener\">Voice Bot Solutions<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/Zoom-Phone-Alternatives\/\" target=\"_blank\" rel=\"noreferrer noopener\">Zoom Phone Alternatives<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/ai-voice-actors\/\" target=\"_blank\" rel=\"noreferrer noopener\">AI Voice Actors<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/alternatives-to-nextiva\/\" target=\"_blank\" rel=\"noreferrer noopener\">Alternatives to Nextiva<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/aspect-ivr\/\" target=\"_blank\" rel=\"noreferrer noopener\">Aspect IVR<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/balto-app\/\" target=\"_blank\" rel=\"noreferrer noopener\">Balto App<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-center-wait-times\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Center Wait Times<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-center-voice-ai\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Center Voice AI<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-center-workflow-software\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Center Workflow Software<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-flow-builder\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Flow Builder<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-flow-designer\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Flow Designer<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-queue-vs-auto-attendant\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Queue vs Auto Attendant<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/call-handling-best-practices\/\" target=\"_blank\" rel=\"noreferrer noopener\">Call Handling Best Practices<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Try our Text-to-Speech Tool for Free Today<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"369\" src=\"https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/voice-ai-tts-11-1024x369.png\" alt=\"voice ai - Call center automation\" class=\"wp-image-14714\" srcset=\"https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/voice-ai-tts-11-1024x369.png 1024w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/voice-ai-tts-11-300x108.png 300w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/voice-ai-tts-11-768x277.png 768w, https:\/\/voice.ai\/hub\/wp-content\/uploads\/2025\/10\/voice-ai-tts-11.png 1345w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><a href=\"https:\/\/voice.ai\/\" target=\"_blank\" rel=\"noreferrer noopener\">Voice AI<\/a> turns text into speech that sounds human, not robotic. Content creators, developers, and educators can pick from a library of expressive voices, generate audio in many languages, and apply SSML for precise control over:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pitch<\/li>\n\n\n\n<li>Speed<\/li>\n\n\n\n<li>Emphasis<\/li>\n<\/ul>\n\n\n\n<p>Try the tool for free and compare generated prompts, dynamic announcements, and recorded messages against older, flat TTS options.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How CCXML and VoiceXML Work Together with Voice AI<\/h3>\n\n\n\n<p>CCXML handles call control while VoiceXML manages dialogs. Use CCXML to create calls, route sessions, handle events, and then hand the caller off to a VoiceXML dialog that plays TTS prompts from Voice AI.&nbsp;<\/p>\n\n\n\n<p>CCXML elements, such as:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Createcall<\/li>\n\n\n\n<li>Transfer<\/li>\n\n\n\n<li>Join<\/li>\n\n\n\n<li>Disconnect<\/li>\n\n\n\n<li>Drive the telephony state<\/li>\n<\/ul>\n\n\n\n<p>When CCXML triggers a VoiceXML document, that document can request synthesized audio via HTTP endpoints, WebSocket streams, or by referencing pre-generated audio files.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Connecting Voice AI to SIP and Media Servers<\/h3>\n\n\n\n<p>Voice AI can stream TTS into a SIP session or provide audio files that your media server plays. Send synthesized audio over RTP or provide an audio URL for your:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Asterisk<\/li>\n\n\n\n<li>FreeSWITCH<\/li>\n\n\n\n<li>Cloud PBX<\/li>\n<\/ul>\n\n\n\n<p>Support for codecs such as G.711 and Opus ensures audio compatibility across PSTN and SIP trunks. Use SRTP and TLS for secure signaling and media transport to meet compliance requirements and reduce latency in live calls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Design Patterns for IVR and Call Center Automation<\/h3>\n\n\n\n<p>Ask yourself which prompts must be live-generated and which can be pre-rendered. For predictable menus and compliance scripts, pre-render and cache audio files to ensure optimal performance. For dynamic text, such as account balances or appointment details, stream SSML requests at call time.&nbsp;<\/p>\n\n\n\n<p>Pair CCXML call control scripts with a call state machine and event handlers so the system can transfer, conference, or record while Voice AI supplies on-the-fly narration.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Handling Events, Transfers, and Conferencing under CCXML<\/h3>\n\n\n\n<p>CCXML raises telephony events that your application can catch and process. When a transfer or consult occurs, use CCXML to manage the session and let Voice AI continue generating prompts or play hold messages.&nbsp;<\/p>\n\n\n\n<p>For conference bridges, stream background music or announcements from Voice AI into the mixed audio. Use CCXML send and catch to coordinate media server actions and to maintain caller context across transfers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Developer Workflows, APIs, and Scripting<\/h3>\n\n\n\n<p>Voice AI exposes REST and streaming APIs that accept plain text or SSML and return audio or live streams. In CCXML workflows, trigger an HTTP request to the TTS endpoint and return an audio URL to the VoiceXML dialog.&nbsp;<\/p>\n\n\n\n<p>Use ECMAScript within VoiceXML for logic and CCXML for call control, allowing your application to handle:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Error events<\/li>\n\n\n\n<li>Busy signals<\/li>\n\n\n\n<li>SIP responses in real-time<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Latency, Scalability, and Reliability for High Volume Calls<\/h3>\n\n\n\n<p>Measure end-to-end latency from text submission to audio playout in a test harness. For high-volume campaigns or predictive dialers, pre-cache frequent prompts and scale TTS instances behind load balancers.&nbsp;<\/p>\n\n\n\n<p>Use async webhooks for long-running conversions and monitor RTP packet loss, jitter, and MOS scores to ensure the agent experience and IVR flows remain stable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Compliance, Recording, and Security Practices<\/h3>\n\n\n\n<p>When calls include card or personal data, route sensitive interactions to masked entry points and avoid logging raw audio where rules forbid it. Encrypt media channels and store recordings with access controls.&nbsp;<\/p>\n\n\n\n<p>Keep audit trails for CCXML event handling, SIP signalling, and TTS requests to support QA and regulatory review.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Testing, Analytics, and Voice Quality Tuning<\/h3>\n\n\n\n<p>Run A\/B tests on voice choices, SSML settings, and prompt phrasing to optimize comprehension and conversion. Capture metrics on failed transfers, call abandonment, and recognition error rates when using ASR alongside TTS.&nbsp;<\/p>\n\n\n\n<p>Use real call samples to iterate on prosody, phrasing, and timing, ensuring that fielded prompts sound natural on both landline and mobile networks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Related Reading<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/contact-center-solution\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact Center Solution<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/conversational-ai-for-the-enterprise\/\" target=\"_blank\" rel=\"noreferrer noopener\">Conversational AI for the Enterprise<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/conversational-business-texting\/\" target=\"_blank\" rel=\"noreferrer noopener\">Conversational Business Texting<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/CX-One-Inc\/\" target=\"_blank\" rel=\"noreferrer noopener\">CX One Inc<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/CXP-Software\/\" target=\"_blank\" rel=\"noreferrer noopener\">CXP Software<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/dialpad-ai\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dialpad AI<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/voice.ai\/hub\/ai-voice-agents\/dialpad-costs\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dialpad Costs<\/a><\/li>\n\n\n\n<li>Dialpad IVR<\/li>\n\n\n\n<li>Dialpad Port Out<\/li>\n\n\n\n<li>Difference Between Chatbot and Conversational AI<\/li>\n\n\n\n<li>Dialpad News<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Improve efficiency and service quality with call centre automation. See how AI tools simplify routing, reporting, and customer communication.<\/p>\n","protected":false},"author":1,"featured_media":14711,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64],"tags":[],"class_list":["post-14710","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai-voice-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Is CCXML? Complete Guide to Call Control Solutions - Voice.ai<\/title>\n<meta name=\"description\" content=\"Improve efficiency and service quality with call centre automation. 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