{"id":65,"date":"2026-04-12T18:40:03","date_gmt":"2026-04-12T18:40:03","guid":{"rendered":"http:\/\/localhost:8080\/?page_id=65"},"modified":"2026-04-15T20:20:50","modified_gmt":"2026-04-15T20:20:50","slug":"web-phone-for-developers","status":"publish","type":"page","link":"https:\/\/www.siperb.com\/kb\/web-phone-for-developers\/","title":{"rendered":"Web Phone for Developers"},"content":{"rendered":"\n<p>Web Phone is the open-source WebRTC\/VoIP SDK behind Siperb \u2014 and it\u2019s yours to use, for free. Take the core JavaScript, drop it into your website, CRM, or SaaS application, and give your users a fully functional softphone right in the browser. No plugins. No downloads. No Siperb branding unless you want it.<\/p>\n\n\n\n<p>It\u2019s the kind of tool that \u201cjust works\u201d \u2014 but gives you the control to make it do exactly what you need. Whether you\u2019re embedding a click-to-call button for customer support, building a full operator console into your CRM, or white-labelling a communications product, Web Phone is the foundation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How It Works<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/kb\/wp-content\/uploads\/2026\/03\/siperb-layers.webp\" alt=\"Web Phone SDK architecture \u2014 layers from browser to PBX\"\/><\/figure>\n\n\n\n<p>At its core, Web Phone is an SDK that handles the heavy lifting of SIP\/WebRTC communication in the browser. You load a single JavaScript file, point it at your PBX (or let Siperb\u2019s proxy handle the connection), and you\u2019ve got a working phone. The SDK manages SIP signalling over WebSocket, WebRTC media negotiation, and the phone UI \u2014 all inside an iframe you control.<\/p>\n\n\n\n<p>You choose how deep you want to go:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use the Browser Phone SDK as-is<\/strong> \u2014 load our pre-built phone UI into an iframe, provision it with SIP credentials, and you\u2019re done in under 20 lines of code.<\/li>\n\n\n\n<li><strong>Bring your own SIP stack<\/strong> \u2014 use the SDK purely for login and provisioning, then wire up your own phone client using SIP.js, JsSIP, or any JavaScript SIP library.<\/li>\n\n\n\n<li><strong>Go fully manual<\/strong> \u2014 skip provisioning entirely, hard-code your PBX details, and use the Browser Phone UI as a self-hosted softphone. Zero Siperb involvement.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Three Ways to Integrate<\/h2>\n\n\n\n<p>Web Phone offers three integration paths, each with a different balance of simplicity, security, and features. Pick the one that fits your setup:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Integration Path<\/th><th>Provisioning<\/th><th>Proxy<\/th><th>Best For<\/th><\/tr><\/thead><tbody><tr><td><a href=\"\/kb\/article\/web-phone-manual-setup\/\">1. Manual Setup<\/a><\/td><td>None (you provide SIP credentials)<\/td><td>No<\/td><td>Developers who want full control, no Siperb account needed. <strong>Completely free.<\/strong><\/td><\/tr><tr><td><a href=\"\/kb\/article\/web-phone-provisioning-direct\/\">2. Siperb Provisioning, Direct to PBX<\/a><\/td><td>Yes (login + fetch config)<\/td><td>No<\/td><td>Managed deployments where you want centralised config but direct PBX connectivity.<\/td><\/tr><tr><td><a href=\"\/kb\/article\/web-phone-provisioning-proxy\/\">3. Siperb Provisioning + Proxy<\/a><\/td><td>Yes<\/td><td>Yes<\/td><td>Full-featured setup with secure credentials, transcoding, SIP trace, and diagnostics. <strong>Recommended.<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What You Get<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Browser Phone SDK<\/strong> \u2014 a complete, embeddable phone UI with dial pad, call controls, transfer, hold, mute, recording, call history, and more. Loads in an iframe, fully styleable.<\/li>\n\n\n\n<li><strong>Provisioning API<\/strong> \u2014 login with a Personal Access Token, fetch device configuration, and have SIP credentials delivered automatically. No hard-coded passwords in your source code.<\/li>\n\n\n\n<li><strong><a href=\"\/kb\/article\/web-phone-click-to-dial\/\">Click to Dial<\/a><\/strong> \u2014 programmatically initiate calls from anywhere in your application. One API call, one click, call placed.<\/li>\n\n\n\n<li><strong>Multiple SDK support<\/strong> \u2014 works with our Browser Phone SDK, SIP.js, JsSIP, or your own SIP stack.<\/li>\n\n\n\n<li><strong>Open source<\/strong> \u2014 inspect, fork, and contribute. Available on <a href=\"https:\/\/github.com\/Siperb\/Web-Phone\" target=\"_blank\">GitHub<\/a>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Requirements<\/h2>\n\n\n\n<p>Getting started is straightforward. You\u2019ll need:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>modern browser<\/strong> with WebRTC support (Chrome, Firefox, Edge, Safari).<\/li>\n\n\n\n<li>Your web app served over <strong>HTTPS<\/strong> \u2014 required for microphone access in most browsers.<\/li>\n\n\n\n<li>A <strong>SIP-compatible PBX<\/strong> (Asterisk, FreeSWITCH, OpenSIPS, or any SIP server) \u2014 or you can use Siperb\u2019s proxy if your PBX doesn\u2019t support WebRTC natively.<\/li>\n<\/ul>\n\n\n\n<p>That\u2019s it. Load the SDK, configure your connection, and you\u2019ve got a phone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Path to Free<\/h2>\n\n\n\n<p>The Web Phone SDK and Browser Phone UI are <strong>completely free<\/strong>. You can self-host, connect directly to your own PBX via WebSocket, and run indefinitely without a Siperb account or any payment.<\/p>\n\n\n\n<p>Where Siperb adds value \u2014 and where costs begin \u2014 is when you need infrastructure that your PBX can\u2019t provide on its own:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SIP Proxy<\/strong> \u2014 routes calls through Siperb\u2019s servers, keeping your PBX credentials hidden from browser source code. Essential for multi-tenant and public-facing deployments.<\/li>\n\n\n\n<li><strong>Media Transcoding<\/strong> \u2014 converts between WebRTC\u2019s encrypted media (DTLS-SRTP\/Opus) and traditional RTP, so legacy PBX systems work without reconfiguration.<\/li>\n\n\n\n<li><strong>Provisioning<\/strong> \u2014 centralised device and credential management via the Admin Control Panel.<\/li>\n\n\n\n<li><strong>Diagnostics<\/strong> \u2014 SIP trace logs, latency monitoring, and call quality analytics.<\/li>\n<\/ul>\n\n\n\n<p>See our <a href=\"\/kb\/pricing\/\">Pricing<\/a> page for details on what\u2019s included at each tier.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Only<\/h2>\n\n\n\n<p>This section covers <strong>browser-based deployment only<\/strong> \u2014 embedding Web Phone into web pages and web applications. If you\u2019re looking for native Desktop (Electron) or Mobile (React Native) apps, those are part of the full <a href=\"\/kb\/siperb-softphone-overview\/\">Siperb Softphone<\/a> product, which includes all platforms under one account.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Articles and Resources<\/h2>\n\n\n<ul class=\"wp-block-latest-posts__list is-grid columns-3 has-dates wp-block-latest-posts has-small-font-size\"><li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/web-phone-provisioning-proxy\/\">Using Siperb Provisioning and Proxy<\/a><time datetime=\"2026-04-12T10:19:45+00:00\" class=\"wp-block-latest-posts__post-date\">April 12, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\">With the 3rd option you will use all the options, and have the most secure solution. Your PBX credentials are securely stored,&#8230;<\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/web-phone-manual-setup\/\">Manual Setup (Direct to PBX)<\/a><time datetime=\"2026-04-12T10:03:23+00:00\" class=\"wp-block-latest-posts__post-date\">April 12, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\">This is the simplest way to get Web Phone running \u2014 and it\u2019s completely free. You load the Browser Phone SDK, provide&#8230;<\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/web-phone-config-options\/\">Configuration Options<\/a><time datetime=\"2026-04-12T10:03:23+00:00\" class=\"wp-block-latest-posts__post-date\">April 12, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\">The ProvisionPhone() method accepts a configuration object that controls how the phone UI behaves, what features are enabled, and how it integrates&#8230;<\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/web-phone-sdk-reference\/\">SDK Reference<\/a><time datetime=\"2026-04-12T10:03:23+00:00\" class=\"wp-block-latest-posts__post-date\">April 12, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\">The Siperb Web Phone SDK exposes a set of core functions under the global window.Siperb namespace. This reference documents the primary methods&#8230;<\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/web-phone-click-to-dial\/\">Web Phone \u2014 Click to Dial<\/a><time datetime=\"2026-04-12T10:03:23+00:00\" class=\"wp-block-latest-posts__post-date\">April 12, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\">Click to Dial \u2014 also known as Click to Call \u2014 is one of the most useful features you can add to&#8230;<\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/web-phone-provisioning-direct\/\">Using Siperb Provisioning (Direct to PBX)<\/a><time datetime=\"2026-04-12T10:03:23+00:00\" class=\"wp-block-latest-posts__post-date\">April 12, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\">This integration path uses Siperb\u2019s provisioning service to manage your SIP configuration centrally \u2014 but your phone still connects directly to your&#8230;<\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"\/kb\/siperb-api-introduction\/\">Siperb API &#8211; Introduction<\/a><time datetime=\"2026-04-07T16:23:16+00:00\" class=\"wp-block-latest-posts__post-date\">April 7, 2026<\/time><div class=\"wp-block-latest-posts__post-excerpt\"><p>Siperb makes use of REST API calls in all its administration and management functions.<\/p>\n<\/div><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Web Phone is the open-source WebRTC\/VoIP SDK behind Siperb \u2014 and it&#8217;s yours to use, for free. Take the core JavaScript, drop it into your website, CRM, or SaaS application, and give your users a fully functional softphone right in the browser. No plugins. No downloads. No Siperb branding unless&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"normal","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Web Phone SDK \u2014 Embed a SIP Phone in Your Website<\/title>\n<meta name=\"description\" content=\"The Siperb Web Phone SDK is an open-source JavaScript library for embedding a fully functional SIP softphone in any website, CRM, or app.\" \/>\n<meta name=\"robots\" content=\"index, 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