Quick to connect.
Add a SIP trunk in affINITy and enter its details in your 3CX, so you’re connected in minutes. Our 3CX specialists are on hand if you want help.
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SIP trunks for 3CX
SIP trunks built for 3CX.
Connect your 3CX to a voice network we own and run. Add a SIP trunk in affINITy, enter its details in your 3CX and you’re live, with numbers in 140+ countries and capacity that grows with your business.
Sell 3CX to your customers? See wholesale SIP trunking
Made for 3CX. Run on our own network.
Tested with every 3CX release.
We test our trunks against each new 3CX version, so you can update 3CX with confidence.
Clear calls, every time.
Your calls travel on our own network, which we monitor and manage ourselves, so the people who run it look after your call quality.
Numbers in 140+ countries.
Give customers a local number wherever you sell, all delivered to your 3CX, and bring the numbers you already have.
Room to grow.
Add channels in affINITy as your team grows, and pay for the calls you handle at once.
3CX specialists behind every trunk.
As a 3CX Titanium Partner and 3CX Solutions Provider, we know 3CX inside out, and one team looks after your trunks and your 3CX questions.
Live in three steps.
Add a SIP trunk in affINITy.
Choose your plan and your channels, and sign in by IP address or with a username and password.
Add your numbers.
Buy new numbers in affINITy or move the ones you have. Porting is free for UK numbers and many international ranges, and ports typically take 7 to 15 business days, though timescales vary by number type and country.
Connect your 3CX.
Enter the trunk details in your 3CX, make a test call and you’re live. Our 3CX specialists are a call away if you want a hand.
Sell 3CX with a specialist behind you.
Add SIP trunks to every 3CX you sell, at wholesale rates, with a team that knows the platform inside out.
Wholesale rates.
Free to join, with no minimum commitment or sales forecast. Channels are on 30-day rolling terms.
Your brand, your price.
Set your own retail price and bill your customers through your own business.
Every customer in one account.
Provision trunks and numbers for each customer yourself in affINITy, and handle everyday changes from one partner account.
3CX specialists behind your team.
As a 3CX Titanium Partner and 3CX Solutions Provider, we know 3CX inside out and test our trunks against every new 3CX release. When a customer’s 3CX needs more than a trunk, our specialists help your team.
Everything your 3CX needs from a trunk.
Direct dial numbers to users, queues and ring groups.
Choose the number you call from, using 3CX’s outbound caller ID options.
Emergency addresses registered in affINITy and assigned to your numbers, so 999 and 112 calls carry the right location.
An alternative route for key numbers, such as a mobile or another site, planned with you.
Sign-in by IP address or username and password, whichever suits how your 3CX is hosted.
Codecs: G.711 A-law and G.711 µ-law, with SIP signalling on UDP port 5060.
Works with self-hosted and 3CX-hosted 3CX, on any version.
Clear pricing, month to month.
- Pay-as-you-go channels
- £4.95 per channel per month, plus the calls you make: UK landlines from 1p a minute, UK mobiles from 7.5p a minute. Rates depend on the call’s direction, the number used and its destination.
- Unlimited channels
- £8.95 per channel per month, including calls to UK landlines (01 and 02 numbers) and to UK mobiles on Vodafone, O2, EE and Three, within the fair use policy below.
- Numbers
- £1.95 per number per month.
- Porting
- Free for UK numbers and many international ranges. Where a country or number type carries a charge, you’ll know before the port goes ahead.
- Minimum term
- One month (30 days).
All prices exclude VAT and were checked on 19 September 2026. Unlimited channels include 3,000 UK landline minutes and 2,000 UK mobile minutes per channel each month, pooled across all your channels: 10 channels share 30,000 landline and 20,000 mobile minutes. They’re for calls made by people, not automated or non-human callers. Calls to other UK and international numbers aren’t included and are charged at standard rates.
Selling to your own customers? Benefit from wholesale rates. See wholesale SIP trunking
Add a SIP trunkWant us to host and manage your 3CX as well?
Managed 3CX puts your phone system on the same network as your trunks, hosted and supported by us.
Equivalent to £5.25 per user per month. For a team of 40 sharing an 8-call system.
Explore Managed 3CXYour questions, answered.
Will your SIP trunks work with our 3CX?
Yes. Add a SIP trunk in affINITy and enter its details in your 3CX. We test our trunks against every new 3CX release.
How many channels do we need?
One for each call you want running at the same time. Most teams match their channels to their 3CX licence size, and you can add more in affINITy whenever you need them.
Can we keep our numbers?
Yes. Porting is free for UK numbers and many international ranges, and any charge is known before the port goes ahead. Ports typically take 7 to 15 business days, though timescales vary by number type and country.
Can we have numbers in other countries?
Yes, in 140+ countries, all delivered to your 3CX. What’s available depends on the country and number type, and we confirm it before you order.
How do 999 calls work?
Register your emergency addresses in affINITy and assign them to your numbers, so 999 and 112 calls carry the right location.
What support do we get?
24/7 cover for business-critical faults. Call us and you get a 15-minute response and a 4-hour repair target, backed by service credits. Our 3CX specialists help with setup and everyday questions.
Is there a minimum term?
One month (30 days).
Can we provision trunks for our customers?
Yes. Partners add SIP trunks and numbers for each customer in affINITy, at wholesale rates, and manage them from one partner account.
Can we bill under our own brand?
Yes. You set your own price and bill your customers through your own business. Joining is free, with no minimum commitment.
Connect your 3CX today.
Add a trunk online in affINITy, or tell us about your 3CX and we’ll recommend the right channels and numbers.
Add a SIP trunk