UK SIP Trunks

Reliable UK SIP Trunk Provider for VoIP with FREE Unlimited UK national & mobile calls

SIP Trunks that are reliable, low cost, with built-in failover, encryption and award-winning 5-star rated support. Works with any Business VoIP PBX system including 3CX & Asterix SIP Server Gateway – lowest costs from $10 per month, per SIP Channel.

unlimited bandwidth

FREE Unlimited UK calls

Keep things simple with free and unlimited 01, 02, 03 and 07 SIP calls included for $10 per SIP channel – with low international charges from less than 1p /min

VOIP sip trunk service no connection charges

Lowest SIP Costs in the UK

With no UK call charges, no “connection charges”, per-second billing and lowest rates on other calls – you can be sure that your SIP VoIP is the cheapest possible – without sacrificing quality of service or support

uk broadband telephone support

5-star UK Support

With award-winning UK help and support direct – not to mention 5 Star Trustpilot and Google reviews – your SIP VoIP gateways are in safe hands. Our systems are well managed and support is prompt and personal.

UK sip trunks

International SIP Gateway

Perfect for non-UK businesses that require a SIP Gateway Provider with low-cost calls for their SIP PBX into the UK market with the lowest possible costs per SIP channel. With our great international network links, latency is low from every country



As well as full TLS / SRTP encryption of calls and secure authentication, we offer ACL’s and IP authentication to ensure your VoIP calls are safe and secure end-to-end. Out-of-bundle restrictions and call limits can also be set

reliable SIP trunks uk cheap

SIP Failover as standard

All of our SIP Trunks come with a second duplicate trunk to our secondary datacentre for ultimate reliability (which can be linked to a the same or a second PBX and/or divert to mobile or landline). Our redundant, self-healing network powers our SIP Trunks with multiple diverse links –  for 99.99% guaranteed uptime

The UK’s best value, lowest cost VoIP SIP Trunks & SIP Channels

No complicated options or minute bundles – prices are per channel with UK calls included. After all, VoIP is supposed to be easier right?
Contact us for reseller and partner details, or if you’d like test our service for a few days to see just how good it is (free if charge).

WEBMATE SIP Trunk Unlimited

$10 per month/channel

when paying annually, $12 month to month

FREE Setup on 3 or more SIP channels
($40 setup fee for 2 or less)

Includes 1x UK Geographical or 03 number
(Additional DDI’s are £7.50 setup – no monthly charge)

UK Calls (01, 02, 03)

UK Mobile (07)

from <1ppm – disabled by default

When paying monthly, you’ll be charged 2 months in advance. No outbound call centres, FUP is that 25% of all calls must be inbound. Failover is only available on 3 or more channel SIP Trunks.

low cost UK SIP trunks –

all UK landline and mobile calls included

WEBMATE SIP Trunk Unlimited


when annually or $12month to month

FREE Setup
(annually, $40 monthly)

UK Calls (01, 02, 03)

UK Mobile

from 1ppm

Low cost UK SIP Trunks – calls included as standard

WEBMATE SIP Trunk Unlimited


per channel, $12 month to month.

How SIP Trunks, VoIP & SIP Gateways work

SIP trunks are digital VoIP “lines” that significantly reduce call charges for businesses of any size whilst allowing complex routing options to maximise the efficiency of your phone system. For example, a US-based company might add some of our SIP trunk channels to their PBX to route all UK-bound calls through. Adding a SIP trunk route to your existing cloud-based or inhouse PBX system is really easy within your software (eg 3CX or Asterix).

sip trunks manage
  • Take advantage of the best SIP call rates per destination country

  • Lower costs for both calls and system rental/lease over traditional systems like ISDN or PBX

  • VoIP and SIP is inherently highly scalable at short notice

  • Resilience guaranteed by our geographically diverse network nodes

  • Consolidate your whole phone PBX system over multiple branches with one system to manage

  • Highly versatile with unlimited configuration and routing options

International SIP Gateway Provider

International VoIP SIP trunks gateway

Our SIP trunks are extremely popular for international companies who need high quality and low cost VoIP call routing for UK-based customers and branch offices. With low or no call charges and the ability to work with any PBX platform – all we need is an IP to confirm the SIP routing on our platform – businesses all over the World can enjoy trouble-free VoIP calls to the UK, including UK mobiles. Perfect for any size business or call centre.

Reduced costs with SIP and VoIP

VOIP lower telephone costs

VoIP is inherently cheaper than full PSTN or ISDN call routing. With WebMate’s SIP Trunks, we bring those cost savings even further with FREE UK (01,02,03) and UK Mobile (07) call charges included with every SIP trunk channel and some of the lowest international outbound charges in the industry through our extensive network partnerships with telco’s and other VoIP providers in every country.

Hosted 3CX VoIP Service

3CX lower costs

Our 3CX Hosted VoIP PBX system is an all-in-one cloud-hosted PBX that’s hosted, managed and maintained for you from just £41.66 per month with 2 UNLIMITED SIP Trunk channels included. 3CX is the world’s best VoIP PBX platform with unlimited extensions and a full range of features suitable for both small business and 100-line call centres alike. With licencing options starting at FREE for smaller companies, to Pro licences for large companies and call centres – it’s the best value VoIP platform by a long way. And our hosted solution is designed to make deployment easier than ever.

FAQs about sip trunks, sip channels, sip providers, costs and prices….

What is a SIP Trunk and SIP Channel?

SIP stands for “Session Initiation Protocol” and is a way internet based phones connect to each other in order to provide an audio service – or telephone service over the internet. A SIP Trunk is the service, like a normal telephone service with landlines and has one master telephone number. a SIP channel is like a line on a phone service – or more like the lines you’d get on and ISDN service. So the more SIP Channels you have, the more simultaneous calls you can make and receive. So you’d have a SIP Trunk for your business with several SIP Channels associated with it, to allow multiple calls.

What is a SIP Gateway (or SIP Server or SIP provider)?

SIP Gateway and SIP Server are often the same thing, but can be different. SIP Gateway is the route your SIP Server (or SIP PBX) might use to connect various types of calls. A SIP Server is usually the actual server which manages your PBX VoIP system – but is sometimes used to describe your SIP gateway Provider. For example you might have a SIP Server (or SIP PBX or VoIP PBX server) – like 3CX or Asterix – which has multiple SIP Gateways from companies like us that you might route different calls types through either for resilience or for cost or service benefits. So if you were based in the US or India for example, you might have a SIP Gateway for Inbound and outbound UK calls, and a different one that handles calls to and from ASIA. SIP is useful that way, allowing you to utilise the internet to make the best choices for which SIP Gateway Provider to use.

How many SIP Channels do I need?

SIP channels are effectively the number of “lines” you have, the number of simultaneous incoming and outgoing calls. It varies for each business, but a general rule is 4 staff per SIP channel. For businesses or departments that are heavily phone-based, like a support team for example, you might want one SIP Channel per staff member because they need to potentially be on the phone all the time.

Can I upgrade my SIP channels?

Yes, you can add SIP channels at any time easily, just let us know and we’ll activate them straight away. Added SIP channels do not restart your minimum contract either, the minimum contract period is per SIP Trunk – so you can keep costs down if you expect to grow for example.

Can I use a WebMate SIP Trunk outside of the uk?

Certainly. As our VoIP and SIP network is UK based we’re well placed to handle your calls to and from the UK – especially with our inclusive UK and UK mobile minutes in all of our SIP services. Our network is multi-honed and well connected all around the world, so the call quality and “latency” is low from every corner of the planet. Our reliable SIP Service is extremely popular with non-UK businesses looking to reduce SIP costs.

What's the contract term for SIP Trunks services?

Our SIP trunks services are all 12 month minimum contracts, payable monthly or annually. Annual pre-payment is the cheapest and the best way to buy SIP services but we’re happy to spread the cost monthly for you too. We require 1+1 months pre-payment for monthly contracts and a credit card or DD on file at all times to ensure your SIP service is maintained.

Are WebMate SIP Trunks compatible with PBX and cloud services like 3cx and Asterix?

Yes, our SIP trunks and SIP channels are fully compliant and work with all SIP software and SIP clients, including 3CX and Asterix.

What calls are included free?

Call to UK umbers starting 01, 02, 03 and 07 are included free of charge with no limitations on call length subject to our Fair Usage Policy.

What is the FUP and why do you have one?

Our Fair Usage Policy only requires that for us to continue your free outbound calls, that at least 25% of your calls are inbound of a maximum of 75% are outbound. For the vast majority of companies, this is usually a 50/50 split anyway – or leaning towards more inbound minutes than outbound. We only do this to protect our low prices and to ensure the SIP services are not used by auto-dialers or call centres which only do huge numbers of outbound only calls (or mainly outbound). As we still have to pay for call minutes with telecom partners we connect with, and pay for the outbound bandwidth etc – if our low cost bundles were used in this way, we’d have to increase the prices for everyone.

Can I have paid-for calls instead with no FUP?

Yes, for call centres or auto-dialer services that would not fit within our FUP, we can quote for minute bundles starting at 5,000 UK minutes per channel.

What happens if I breech the FUP?

Sometimes you might find you make an extraordinary amount of outgoing calls for one reason or another, which is fine, we’re happy to let it slip once or twice a year – it should all balance out generally and no harm done. However, for 2 consecutive breeches, or 3 in a year, we reserve the right to terminate the bundle minutes and charge our standard minutes rate for all calls retrospectively (1p for landline,5p for mobiles). But you shouldn’t ever accidentally find yourself here, you’ll know from the outset if more than 75% of your calls are outbound generally.

Is there any failover for SIP trunks?

Our SIP trunks are very reliable and come with as 99.9% uptime guarantee. Whilst we can provide bespoke failover services like redirect or voicemail on the SIP channels themselves, this is normally the job of your SIP Server or cloud-based SIP software. Our Hosted 3CX service for example, provides failover service on the SIP client end, which is the most likely to suffer a failure.

Are SIP trunks cheaper than ISDN or PSTN?

Yes, almost always considerably cheaper. ISDN or PSTN lines usually cost more in rental than our SIP services, and then you have old-fashioned call charges to pay (and even “connection charges” sometimes!). Typically using SIP trunks is at least 20% cheaper but most businesses find themselves saving 60% or more on their telephone costs – especially with our inclusive SIP bundles.

Are SIP trunks and SIP channels not real?

There’s some sites and services that claim that SIP Trunks are made up out of thin air as an excuse for telecoms companies to regain revenue from losing the traditional PSTN and ISDN services (when they are phased out over time, by 2025 in the UK). Whilst a small part of that is true: SIP to SIP calls do establish a connection freely over the internet and you do not need a paid for SIP provider for those. However a SIP gateway service like ours does more than single SIP to SIP, it acts as a routing and middle-man for SIP sessions (calls), connects to other SIP providers in faster and better ways than just relying on the internet, and most importantly, provides SIP to PSTN/ISDN calls (which still cost money per minute). So no, a proper SIP provider has lots of costs associated with providing the SIP Services. Usually the ones claiming it to be a “made up” thing, are doing so to convince you either to pay for SIP calls individually with them or to cover their costs in hidden ways…. Our SIP Trunks are great value!

So you do a Free SIP trunk like some other providers?

There are some “Free” SIP services out there, but they all charge you somehow in order to cover their costs, and often skimp on things like call quality, network reliability and support. You’ll generally get these charged on a PAYG basis per minute, often with high prices for mobiles and international calls. With our call-inclusive SIP trunks, you won’t get any shocks and pay a single low monthly fee per SIP Channel.

Can I test your SIP Services?

Sure, we’d be happy to lend you a SIP trunk for a few days to test the quality and reliability, subject to availability – just let us know and we’ll set this up for you.

Google Reviews – 5 STAR

Based on 85+ verified reviews (4.9 average)

trustpilot excellent ISP reviews

Based on 145+ reviews, average score 4.8. View all Trustpilot reviews here.

I have been with WebMate since dial-up access days! Stayed with them mainly because of their excellent customer service – prompt, helpful, and knowledgeable. They even ring you back if their line is busy! What a relief not to have to deal with a far flung call centre or poorly informed staff reading from a script. Efficient service and staff very supportive, helpful and patient. Treated like a person as opposed to a number.

13 Aug 2020

Great support as always from WebMate! I’ve used Webmate for about 8 years now and they are always superb at delivering, friendly, honest coherent support in a really timely manner! I don’t hesitate to recommend them. Thank you Pete, Charlie, Lewis and all the team!

Guy Press
Designer - 5 Aug 2020

Excellent Service. Webmate have always been helpful and prompt in dealing with queries and problems but they surpassed themselves with a recent issue I had. At all times they replied very quickly, sometimes in only a few minutes, and were very patient in finding a solution that was not obvious and hence took several attempts to sort out. I can’t see you getting this level of service from some of the larger ISPs.

Roger Adams
GB - 19 July 2020

Webmate have been my preferred ISP for sometime. Consistently excellent service and superb uptimes.
They recently prepared a website for me. A superb job for the price.I cannot recommend them too highly.

Kieth Straughan
US - 17 July 2020

I have been with WebMate since 1998 and I cannot fault their excellent service and competitive rates for web-building and email hosting. No voice recognition frustration options when you call, but a familiar friendly voice to help you with any computer issues to hand.

Annabel Yates
Cornwall- 4 July 2020

Excellent service. The best Mac web provider out there. Any issues have been sorted extremely quickly and politely. Thank you. No holding on to phone lines for ever and ever. Quick response if even I’ve phoned. Tickets generated for problems sorted over night at the slowest.

Geoff Bridge
UK - 13 June 2020

WebMate Shines. Best outfit out there… Always available, friendly, and knowledgeable; go out of their way to resolve any issues, both email and/or web support issues. Can’t say enough about these people.

Peter Streimac
USA - 30 April 2020

A wonderful company – efficient, helpful and simply the best (my experience of 15 years impeccable service)

Stephen Frankel
UK - 6 April 2020

I had no Broadband, so I phoned WebMate and I got the usual guy’s (based in Cornwall) to sort my problem within one day, I’ve been dealing with the same people for 20 years, that says everything! They got back to me to say that leave it with us, we’re working on it, and sure enough, it was fixed shortly afterwards. I truly believe that WebMate is the best and most honest company that I have ever dealt with, they are exceptional. Thank you all very much again.

Robert Irvine
Scotland - 14 Feb 2020

A company that will actually talk to it’s customers. In a world where most companies seem to be set up to make it as hard as possible for you to talk to a real person, WebMate is a breath of fresh air. There are real, always helpful people just a phone call away. I have never for a moment regretted changing from the ever unhelpful BT. I don’t write reviews normally but this company deserves a bit of my time for going out of its way to be helpful to its customers rather than keeping them at arms length. I would highly recommend them.


Chis Morley
UK - 13 Sep 2019

The best SIP Trunk Gateway VoIP Service in the UK

85% of Support Tickets answered within 2 hours
82% of Customers have been with us for 8 years+
99.99% Hosting and Email uptime
35 seconds average call wait time
Time to First Byte for Web Hosting
9.5 / 10 average customer support ticket response rating
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