{"id":19446,"date":"2020-11-11T13:57:16","date_gmt":"2020-11-11T12:57:16","guid":{"rendered":"https:\/\/fonvirtual.com\/en\/?p=19446"},"modified":"2026-07-28T18:51:45","modified_gmt":"2026-07-28T16:51:45","slug":"sip-number","status":"publish","type":null,"link":"https:\/\/fonvirtual.com\/en\/blog\/sip-number\/","title":{"rendered":"SIP number: what it is, how to get one, and how much it costs"},"content":{"rendered":"<style id=\"fv-tb-hide\">.et_pb_row_inner_1_tb_body,.et_pb_image_0_tb_body{display:none!important}<\/style><div id=\"fv-meta-share\" style=\"position:relative;background:#fff;border:1px solid #ececf1;border-radius:12px;box-shadow:0 4px 18px rgba(20,20,60,0.05);padding:16px 18px;margin:0 0 24px 0;max-width:760px;font-family:inherit;\"><div style=\"display:flex;flex-wrap:wrap;align-items:center;gap:13px;\"><a href=\"https:\/\/fonvirtual.com\/en\/profile-of-emma-smith\/\" style=\"display:inline-flex;align-items:center;gap:10px;text-decoration:none;\"><img loading=\"lazy\" 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style=\"display:flex;flex-wrap:wrap;gap:10px;padding-left:8px;\"><a data-ai=\"https:\/\/chatgpt.com\/?q=\" target=\"_blank\" rel=\"nofollow noopener\" style=\"display:inline-flex;align-items:center;gap:8px;background:transparent;color:#2b2f3a;text-decoration:none;font-size:13px;font-weight:600;padding:9px 16px;border:1px solid #dcdce4;border-radius:26px;line-height:1;\"><span style=\"width:8px;height:8px;border-radius:50%;background:#12a37f;display:inline-block;\"><\/span>ChatGPT<\/a><a data-ai=\"https:\/\/claude.ai\/new?q=\" target=\"_blank\" rel=\"nofollow noopener\" style=\"display:inline-flex;align-items:center;gap:8px;background:transparent;color:#2b2f3a;text-decoration:none;font-size:13px;font-weight:600;padding:9px 16px;border:1px solid #dcdce4;border-radius:26px;line-height:1;\"><span style=\"width:8px;height:8px;border-radius:50%;background:#d97757;display:inline-block;\"><\/span>Claude<\/a><a data-ai=\"https:\/\/www.perplexity.ai\/search?q=\" target=\"_blank\" rel=\"nofollow noopener\" style=\"display:inline-flex;align-items:center;gap:8px;background:transparent;color:#2b2f3a;text-decoration:none;font-size:13px;font-weight:600;padding:9px 16px;border:1px solid #dcdce4;border-radius:26px;line-height:1;\"><span style=\"width:8px;height:8px;border-radius:50%;background:#1fb8a6;display:inline-block;\"><\/span>Perplexity<\/a><\/div><div style=\"font-size:11.5px;color:#9a9aae;margin:14px 0 0;padding-left:8px;\">Opens in a new tab \u00b7 ChatGPT and Perplexity don&#8217;t require an account<\/div><\/div><script> (function(){ var card=document.getElementById('fv-resumen-ia'); if(!card)return; var h1=document.querySelector('article h1')||document.querySelector('h1'); var title=h1?h1.textContent.trim():document.title.replace(\/\\s*[|\\-\u2013\u2014].*$\/,'').trim(); var link=window.location.href; var enc=encodeURIComponent('Summarize this article from the Fonvirtual blog. Title: \u00ab'+title+'\u00bb. Link: '+link); card.querySelectorAll('a[data-ai]').forEach(function(a){a.href=a.getAttribute('data-ai')+enc;}); })(); <\/script>\n\n\n<p class=\"wp-block-paragraph\">A <strong>SIP number<\/strong> is a phone number \u2014 geographic, national, or mobile \u2014 delivered over an IP connection using the <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc3261\" target=\"_blank\" rel=\"noopener\">Session Initiation Protocol (RFC 3261)<\/a> rather than the traditional copper PSTN. From the caller&#8217;s point of view, a SIP number looks and behaves exactly like a normal phone number: you dial it from a mobile, a landline, or another VoIP client, and it rings. The difference is on the network side: the call is routed over the internet to a SIP endpoint \u2014 an IP phone, a softphone, or a cloud PBX extension. In 2026, a SIP number is the default choice for UK and EU businesses replacing ISDN lines, opening new geographic markets, or equipping remote and hybrid teams.<\/p>\n \n<p class=\"wp-block-paragraph\">For the protocol background, read our guide on <a href=\"https:\/\/fonvirtual.com\/en\/blog\/what-are-sip-calls-and-how-does-it-work\/\">what SIP calls are and how they work<\/a>. For a practical extension on an existing PBX, see <a href=\"https:\/\/fonvirtual.com\/en\/blog\/how-to-call-a-pbx-extension\/\">how to call a PBX extension directly<\/a>. To understand the broader landscape, see our <a href=\"https:\/\/fonvirtual.com\/en\/blog\/best-virtual-pbx\/\">best virtual PBX<\/a> comparison and our <a href=\"https:\/\/fonvirtual.com\/en\/blog\/telephone-extensions\/\">telephone extensions in general<\/a> overview.<\/p>\n \n<h2 class=\"wp-block-heading\">What exactly is a SIP number?<\/h2>\n \n<p class=\"wp-block-paragraph\">A SIP number is the combination of three things:<\/p>\n \n<ol class=\"wp-block-list\">\n<li><strong>A regular phone number<\/strong> in E.164 format (for example, <code>+44 20 4538 1234<\/code> for a London number, or <code>+34 91 123 45 67<\/code> for Madrid). It is reachable from any phone network in the world.<\/li>\n<li><strong>A SIP account<\/strong> registered with a VoIP provider (Fonvirtual, 3CX, RingCentral, BT, Gamma, Vonage, etc.). The account carries the credentials used by your device to register.<\/li>\n<li><strong>A SIP endpoint<\/strong> \u2014 the device or app that rings when the number is called. It can be a physical IP desk phone, a softphone on a laptop, a mobile app, or a web browser using WebRTC.<\/li>\n<\/ol>\n \n<p class=\"wp-block-paragraph\">The key difference from a traditional PSTN number is flexibility. With PSTN, a number is bound to a physical line at a fixed address. With SIP, the number is bound to an account that can be re-pointed to any device, in any location, in minutes. Move offices, change providers, switch from desk phone to mobile app: the number stays the same.<\/p>\n \n<h2 class=\"wp-block-heading\">Types of SIP numbers available in 2026<\/h2>\n \n<p class=\"wp-block-paragraph\">SIP numbers fall into four broad categories, each with its own pricing model and regulatory treatment.<\/p>\n \n<figure class=\"wp-block-table is-style-stripes\"><table style=\"border-collapse:collapse;width:100%;\"><thead><tr><th style=\"border:1px solid #ccc;padding:8px;background:#f2f2f2;text-align:left;\">Type<\/th><th style=\"border:1px solid #ccc;padding:8px;background:#f2f2f2;text-align:left;\">Format<\/th><th style=\"border:1px solid #ccc;padding:8px;background:#f2f2f2;text-align:left;\">Typical monthly cost (UK, 2026)<\/th><th style=\"border:1px solid #ccc;padding:8px;background:#f2f2f2;text-align:left;\">Porting<\/th><\/tr><\/thead><tbody>\n<tr><td style=\"border:1px solid #ccc;padding:8px;\">Geographic (DID)<\/td><td style=\"border:1px solid #ccc;padding:8px;\">01\/02 + local code (e.g. 020 for London)<\/td><td style=\"border:1px solid #ccc;padding:8px;\">\u00a31\u2013\u00a35 per number<\/td><td style=\"border:1px solid #ccc;padding:8px;\">1 working day, free<\/td><\/tr>\n<tr><td style=\"border:1px solid #ccc;padding:8px;\">National<\/td><td style=\"border:1px solid #ccc;padding:8px;\">0330, 0333, 0800, 0808, 0845<\/td><td style=\"border:1px solid #ccc;padding:8px;\">\u00a32\u2013\u00a310 per number + per-minute<\/td><td style=\"border:1px solid #ccc;padding:8px;\">1\u20135 working days<\/td><\/tr>\n<tr><td style=\"border:1px solid #ccc;padding:8px;\">Mobile<\/td><td style=\"border:1px solid #ccc;padding:8px;\">07xxx xxx xxx<\/td><td style=\"border:1px solid #ccc;padding:8px;\">\u00a33\u2013\u00a38 per number<\/td><td style=\"border:1px solid #ccc;padding:8px;\">Same provider restriction, 1 working day<\/td><\/tr>\n<tr><td style=\"border:1px solid #ccc;padding:8px;\">International iNUM \/ DDI<\/td><td style=\"border:1px solid #ccc;padding:8px;\">+ country code + local number<\/td><td style=\"border:1px solid #ccc;padding:8px;\">\u00a32\u2013\u00a315 per number per country<\/td><td style=\"border:1px solid #ccc;padding:8px;\">Depends on country regulator<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n \n<p class=\"wp-block-paragraph\"><strong>Geographic SIP numbers<\/strong> are the most common in business. A London-based company that wants to appear local in Manchester simply provisions a Manchester SIP number (0161) and points it to the same London reception. The caller dials a normal UK number; the call routes over IP to the London team.<\/p>\n \n<p class=\"wp-block-paragraph\"><strong>National non-geographic numbers<\/strong> like 0800 (freephone) and 0333 (local-rate) are often used for customer service lines. Ofcom&#8217;s <a href=\"https:\/\/www.ofcom.org.uk\/phones-telecoms-and-internet\/advice-for-consumers\/scams\/phone-scams\" target=\"_blank\" rel=\"noopener\">guidance on phone numbering and call charges<\/a> sets the consumer protection rules for these ranges.<\/p>\n \n<p class=\"wp-block-paragraph\"><strong>International SIP numbers<\/strong> (sometimes called DDI or iNUM) let you present a local presence in 50+ countries from a single platform. A Spanish company can hand out a French, German, and UK number to customers, all ringing into the same Madrid-based team.<\/p>\n \n<h2 class=\"wp-block-heading\">How to get a SIP number in 5 steps<\/h2>\n \n<p class=\"wp-block-paragraph\">Provisioning a SIP number is straightforward and typically takes minutes once you have chosen a provider.<\/p>\n \n<ol class=\"wp-block-list\">\n<li><strong>Choose a VoIP provider<\/strong> \u2014 in the UK and EU, the main categories are: (a) pure-cloud PBX platforms (Fonvirtual, 3CX, RingCentral, Genesys, Zoom Phone, Microsoft Teams Phone); (b) traditional telcos with SIP trunk products (BT, Gamma, TalkTalk Business, Virgin Media O2 Business); (c) niche providers focused on international DIDs (Teloz, DIDWW, Voxbone).<\/li>\n<li><strong>Pick a number<\/strong> \u2014 most providers show a real-time inventory of available numbers by area code. You can often choose a memorable or vanity number (e.g. 020 7946 0123).<\/li>\n<li><strong>Complete KYC checks<\/strong> \u2014 UK and EU regulations require identity verification before activating a number. You&#8217;ll be asked for a company registration document, an address, and a contact person. The activation is usually automatic after the checks pass.<\/li>\n<li><strong>Configure the SIP endpoint<\/strong> \u2014 install a softphone (Zoiper, Bria, Linphone, or the provider&#8217;s own app) on your device, or plug in an IP desk phone. Enter the SIP server address, username, and password provided in the welcome email.<\/li>\n<li><strong>Test and go live<\/strong> \u2014 make a test call in and out, check call quality, and configure failover routes (e.g. forward to mobile if the SIP endpoint is unreachable). Your SIP number is live.<\/li>\n<\/ol>\n \n<h2 class=\"wp-block-heading\">What does a SIP number cost in 2026?<\/h2>\n \n<p class=\"wp-block-paragraph\">The total cost of a SIP number has three components, and you should compare all three across providers, not just the headline rate.<\/p>\n \n<ul class=\"wp-block-list\">\n<li><strong>Number rental<\/strong> \u2014 typically \u00a31\u2013\u00a315 per month per number, depending on the type (geographic, national, international).<\/li>\n<li><strong>Inbound call minutes<\/strong> \u2014 usually included in a bundle. UK landline-to-SIP calls are free or near-free; UK mobile termination costs around 1\u20133 p\/min in 2026.<\/li>\n<li><strong>Outbound call minutes<\/strong> \u2014 UK landline and mobile bundles range from \u00a310 to \u00a325 per user per month for unlimited; per-minute rates are 0.5\u20132 p for UK landlines and 3\u20138 p for UK mobiles.<\/li>\n<\/ul>\n \n<p class=\"wp-block-paragraph\">International calls follow a per-minute rate card (e.g. \u20ac0.02\/min to most of the EU and US, \u20ac0.10\u2013\u20ac0.30\/min to mobile in those regions). Many providers also offer a small number of <strong>free international minutes<\/strong> as part of higher-tier plans.<\/p>\n \n<h2 class=\"wp-block-heading\">Porting an existing number to SIP<\/h2>\n \n<p class=\"wp-block-paragraph\">If you already have a phone number on the PSTN or ISDN, you can <strong>port<\/strong> it to a SIP provider without changing the digits your customers dial. In the UK, Ofcom&#8217;s <em>General Conditions of Entitlement<\/em> give you the right to port a geographic or mobile number to any compatible provider, typically within <strong>1 working day<\/strong> for single-line ports and up to 10 working days for multi-line or complex ports. The losing provider cannot refuse a port unless there is a regulatory reason (e.g. the number is under investigation).<\/p>\n \n<p class=\"wp-block-paragraph\">During the port, the number is briefly unreachable. Most providers schedule the cutover for early morning or out-of-hours to minimise disruption.<\/p>\n \n<h2 class=\"wp-block-heading\">Practical use cases for a SIP number<\/h2>\n \n<ul class=\"wp-block-list\">\n<li><strong>Replacing ISDN<\/strong> \u2014 the UK PSTN switch-off runs 2025 to 2027. A SIP number is the direct, low-friction replacement for an ISDN line.<\/li>\n<li><strong>Multi-site presence<\/strong> \u2014 a UK company with offices in London and Manchester gives customers a local number for each, both ringing into the same cloud PBX.<\/li>\n<li><strong>International expansion<\/strong> \u2014 a London startup launches in Paris and Berlin by provisioning French (+33) and German (+49) SIP numbers, all answered by the same UK team.<\/li>\n<li><strong>Remote and hybrid workers<\/strong> \u2014 a sales rep based in Cornwall keeps the company&#8217;s 020 London number on their mobile softphone, indistinguishable from a desk-based colleague.<\/li>\n<li><strong>Per-employee direct lines<\/strong> \u2014 DDI (Direct Dial Inward) numbers let customers reach a specific person without going through a switchboard, useful for sales reps, account managers, and support specialists.<\/li>\n<\/ul>\n \n<h2 class=\"wp-block-heading\">Frequently asked questions about SIP numbers<\/h2>\n \n<h3 class=\"wp-block-heading\">Is a SIP number the same as a virtual number?<\/h3>\n \n<p class=\"wp-block-paragraph\">Functionally, yes. A <strong>virtual phone number<\/strong> is the user-facing term; a <strong>SIP number<\/strong> is the technical term for a virtual number delivered over a SIP connection. Most providers and most customers use the terms interchangeably. The exception is mobile virtual numbers, which can be SIP-based or app-based (e.g. Skype-style) \u2014 check the underlying technology before assuming PSTN-grade reliability.<\/p>\n \n<h3 class=\"wp-block-heading\">Can I keep my existing phone number?<\/h3>\n \n<p class=\"wp-block-paragraph\">Yes. Number porting is a regulated right in the UK and EU. Provide your new SIP provider with a copy of a recent bill from the current provider, and they will run the port. For a single UK landline, the port typically completes in 1 working day.<\/p>\n \n<h3 class=\"wp-block-heading\">Do I need internet to use a SIP number?<\/h3>\n \n<p class=\"wp-block-paragraph\">To make and receive calls, yes \u2014 the SIP endpoint needs an internet connection (broadband, fibre, 4G\/5G, or Ethernet). The actual phone number is portable: the moment your internet drops, you can forward all calls to a mobile number with a single setting in the provider&#8217;s control panel.<\/p>\n \n<h3 class=\"wp-block-heading\">What happens if my internet goes down?<\/h3>\n \n<p class=\"wp-block-paragraph\">Most cloud PBX platforms offer <strong>automatic failover<\/strong>: if the SIP endpoint cannot be reached, calls are redirected to a backup number (typically a mobile) or to voicemail. For mission-critical lines, providers offer a 4G\/5G router as a secondary connection, with the PBX using whichever link is up. For emergency services, remember that the address transmitted to 999\/112 is the one registered on the SIP number, not your current location \u2014 a personal mobile is the safer choice for emergency calls when travelling.<\/p>\n \n<h3 class=\"wp-block-heading\">Can a SIP number receive SMS?<\/h3>\n \n<p class=\"wp-block-paragraph\">It depends on the number type and provider. <strong>Mobile<\/strong> SIP numbers (07xxx) usually support SMS over SIP, but delivery is not guaranteed across all carriers. <strong>Geographic<\/strong> numbers (01\/02) are designed for voice only and cannot receive SMS. For business messaging, it is better to use a dedicated SMS service or a platform that bridges SIP to a messaging API.<\/p>\n \n<h3 class=\"wp-block-heading\">How is a SIP number different from a DID?<\/h3>\n \n<p class=\"wp-block-paragraph\">DID stands for <strong>Direct Inward Dialing<\/strong> (or Direct Dial-In). It is a technical term for a number that bypasses a switchboard and reaches a specific extension or person directly. A SIP number can be a DID \u2014 in fact, in a cloud PBX, every extension typically has its own DID. The terms are used interchangeably in many contexts, but DID emphasises the routing behaviour, while SIP number emphasises the technology.<\/p>\n \n<h3 class=\"wp-block-heading\">Do I need a separate SIP number for each employee?<\/h3>\n \n<p class=\"wp-block-paragraph\">Not necessarily. Many businesses give one main number (e.g. 020 4538 1000) plus a block of DDI numbers (1001, 1002, 1003, \u2026) for direct employee lines. A small team can share a single SIP number and use extension dialling (203, 204, 205) once the call reaches the main number. For client-facing roles (sales, account management, support), DDI numbers are worth the small monthly cost.<\/p>\n \n<p class=\"wp-block-paragraph\" style=\"margin-top:30px;\">\u2014 <em>Fonvirtual editorial team \u00b7 Updated July 2026<\/em><\/p>\n\n\n<style id=\"fv-blog-cats-css\"> nav.fv-blog-cats{--fv:#f6343f;--fv-osc:#d8252f;--fv-tinta:#1a1a2e;--fv-borde:#e6e6ea;font-family:inherit;max-width:1180px;margin:28px auto 18px;padding:0 4px;text-align:center!important;} nav.fv-blog-cats .fv-cats-titulo{font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#9a9aae;margin:0 0 14px;} nav.fv-blog-cats ul.fv-cats-lista{display:inline-flex;flex-wrap:wrap;justify-content:center;gap:10px 12px;list-style:none!important;margin:0;padding:0!important;text-align:center;} nav.fv-blog-cats .fv-cats-lista a{display:inline-flex!important;align-items:center;gap:7px;padding:9px 18px;border-radius:999px;border:1px solid var(--fv-borde);background:#fff!important;color:#000!important;font-size:14px;font-weight:400;line-height:1;text-decoration:none!important;white-space:nowrap;cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease,box-shadow .15s ease,transform .1s ease;} nav.fv-blog-cats .fv-cats-lista a:hover{border-color:var(--fv);color:var(--fv)!important;background:#fff5f5;box-shadow:0 4px 14px -6px rgba(246,52,63,.45);text-decoration:none!important;} nav.fv-blog-cats .fv-cats-lista a:active{transform:translateY(1px);} nav.fv-blog-cats .fv-cats-lista a:focus-visible{outline:3px solid rgba(246,52,63,.4);outline-offset:2px;} nav.fv-blog-cats .fv-cats-dot{width:8px;height:8px;border-radius:50%;background:var(--fv);opacity:1;flex-shrink:0;} nav.fv-blog-cats .fv-cats-lista a.fv-cats-activo{background:var(--fv)!important;border-color:var(--fv);color:#fff!important;box-shadow:0 6px 16px -6px rgba(246,52,63,.6);} nav.fv-blog-cats .fv-cats-lista a.fv-cats-activo:hover{background:var(--fv-osc);color:#fff!important;} nav.fv-blog-cats .fv-cats-lista a.fv-cats-activo .fv-cats-dot{opacity:1;background:#fff;} @media (max-width:600px){nav.fv-blog-cats ul.fv-cats-lista{display:flex;flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;padding-bottom:6px;-webkit-overflow-scrolling:touch;scrollbar-width:thin;scrollbar-color:var(--fv-borde) transparent;}nav.fv-blog-cats .fv-cats-lista::-webkit-scrollbar{height:6px;}nav.fv-blog-cats .fv-cats-lista::-webkit-scrollbar-thumb{background:var(--fv-borde);border-radius:3px;}nav.fv-blog-cats .fv-cats-lista a{flex-shrink:0;}} <\/style><nav class=\"fv-blog-cats\" aria-label=\"Blog categories\"><p class=\"fv-cats-titulo\">Explore by category<\/p><ul class=\"fv-cats-lista\"><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/\" data-fvcat=\"\"><span class=\"fv-cats-dot\"><\/span>All<\/a><\/li><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/category\/technology\/\" data-fvcat=\"technology\"><span class=\"fv-cats-dot\"><\/span>Technology<\/a><\/li><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/category\/professional-communications\/\" data-fvcat=\"professional-communications\"><span class=\"fv-cats-dot\"><\/span>Professional Communications<\/a><\/li><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/category\/features\/\" data-fvcat=\"features\"><span class=\"fv-cats-dot\"><\/span>Features<\/a><\/li><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/category\/artificial-intelligence\/\" data-fvcat=\"artificial-intelligence\"><span class=\"fv-cats-dot\"><\/span>Artificial Intelligence<\/a><\/li><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/category\/call-center-cloud-technology\/\" data-fvcat=\"call-center-cloud-technology\"><span class=\"fv-cats-dot\"><\/span>Call center<\/a><\/li><li><a href=\"https:\/\/fonvirtual.com\/en\/blog\/category\/channels\/\" data-fvcat=\"channels\"><span class=\"fv-cats-dot\"><\/span>Channels<\/a><\/li><\/ul><\/nav><script> (function(){ var root=document.querySelector('.fv-blog-cats'); 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