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UK SIP Trunk Provider

Tier 1 UK SIP termination from Telehouse London and BT Cardiff. Route UK fixed, mobile, toll-free and NGN traffic through didlogic’s own infrastructure with unlimited channels, sub-second PDD and no reseller stack.
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UK network you can route on, not a reseller stack

didlogic runs UK voice traffic through on-shore infrastructure, direct carrier relationships and our own autonomous system. You get a UK SIP trunk built for production traffic, not a reseller path hidden behind a generic cloud voice product.
  • 3–4 ms ping in London from Telehouse North
  • 10–20 ms nationwide from BT Cardiff
  • Direct routes to UK fixed and mobile networks, with no aggregator hops
  • G.711 end-to-end, with no transcoding to G.729
  • Carrier-grade availability backed by 24/7 monitoring
UK network you can route on, not a reseller stack
UK SIP termination rates
Landline - $0.0049/min
Orange - $0.0175/min
O2 - $0.0175/min
Vodafone - $0.0175/min
H3G - $0.0175/min
0800 Freephone - $0.05/min
NGN 08XX - $0.1021/min
Per-second billing on Plus accounts and above. No minimums, no setup fees.
UK DID numbers, every area code
London - $0.5/month
Manchester - $0.5/month
Birmingham - $0.99/month
0800 Freephone - $0.99/month
Other - $0.45/month
UK area codes available, up to 500 concurrent channels per DID, paperless porting with zero downtime, and caller ID passthrough on verified Plus accounts.

UK SIP trunk use cases

Outbound contact centres and dialers
High ASR to UK fixed and mobile, sub-second PDD, no concurrency limits, custom CLI rotation on verified accounts. Predictive dialing supported, with guidance to align with Ofcom persistent-misuse rules. SIP REFER for warm transfers. Hundreds of on-shore and off-shore UK call centre deployments running on the trunk today.
AI voice agents
UK termination and DIDs that connect to Retell, Vapi, ElevenLabs, LiveKit, Bland AI and Synthflow via Bring Your Own Carrier. Local London routing keeps real-time round-trip latency low for conversational agents.

Explore AI voice →
International business teams needing UK presence
Buy a London 020 or any UK geographic number, point it to your SIP endpoint, a mobile, or a forwarding destination. No UK office required. Calls receive proper UK Caller ID presentation.
Carriers and resellers
didlogic as your UK upstream. Wholesale rate ladder, A-number handling, white-label DIDs, voice peering available at the data centre level.
Why didlogic vs other UK SIP trunks
didlogic Typical UK SIP trunk
Routing policy Tier 1 only Mixed Tier 1 and grey
Codec end-to-end G.711 throughout Often transcoded to G.729
Concurrent channels Unlimited Per-channel pricing
UK PoPs Telehouse London + BT Cardiff Single London site
Custom Caller ID Passthrough on verified accounts Often blocked
Network ownership Own AS13006, own hardware Resold over an underlying carrier
Onboarding 30-day no commitment, free test DID, up to $100 in free credits Sales-gated, multi-year contracts

How UK SIP trunk setup works

Step 1. Create your didlogic account
Get free credits and request a UK test DID if needed.
Step 2. Connect your system
Use SIP credentials or IP authentication to connect your PBX, SBC, dialer or AI voice platform.
Step 3. Test UK routes
Validate audio quality, PDD, ASR, CLI presentation and route stability with a controlled traffic slice.
Step 4. Port existing UK numbers
Move your UK numbers through didlogic’s paperless porting workflow.
Step 5. Go live
Cut over production traffic once testing is complete, with no per-channel fees and no long-term commitment required.

SIP trunk compatibility

PBX systems
Asterisk, FreeSWITCH, 3CX, FreePBX, Cisco Unified CME, Avaya IP Office, Nortel, and most other SIP-based PBX products.
AI voice platforms
Retell, Vapi, ElevenLabs, LiveKit, Bland AI, Synthflow.
Codecs
G.711 u-law and a-law, G.722 HD voice, GSM, G.729.
Authentication
Self-serve your SIP credentials or IP authentication instantly from the didlogic portal. Provisioning is real-time, meaning you can start routing calls in minutes.

View Configuration Guides →
Security
SIP TLS for signalling, SRTP for media.
Paperless UK number porting
The UK is one of seven countries where didlogic offers fully electronic number porting. Submit a port request from the self-service portal, we drive the carrier-side workflow, you keep your existing UK numbers with zero downtime on cutover.
Ready for the 2027 PSTN switch-off
Openreach retires the UK PSTN on 31 January 2027. ISDN30, ISDN2 and analogue business lines stop working on that date. Teams still on legacy infrastructure need an IP-based replacement well before the cutover. didlogic UK SIP trunks plug into existing on-premise PBXs or sit behind hosted systems. Bring your existing UK numbers via paperless porting and keep them through cutover day.

Our clients

FAQ: UK SIP Trunk

Do you charge per channel?

No. Send 10 concurrent calls or 10,000. You pay only for minutes.

Can I port my existing UK numbers?

Yes. The UK supports paperless porting. Most ports complete in 5 to 10 working days with zero downtime on cutover.

Do you support custom Caller ID on UK outbound calls?

Yes, on verified business accounts at Plus level and above. We require proof of address before enabling Caller ID passthrough.

Do you support predictive dialing on UK trunks?

Yes. Predictive dialing is supported. We recommend reviewing Ofcom guidance on persistent misuse and silent call rules when setting your dialer’s abandon rate.

What is the typical PDD on UK calls?

0.3 to 1.5 seconds to UK ringback.

Where are UK calls homed?

SIP signalling and RTP media flow through Telehouse London or BT Cardiff. Voice traffic is routed locally to UK Tier 1 carriers without leaving the country.

Do you support SIP TLS and SRTP?

Yes. Both are available for signalling and media encryption.

Do you offer 0800 inbound numbers?

Yes. 0800 Freephone DIDs from $0.99/month with high inbound channel capacity.

Which AI voice platforms work with your UK SIP trunks?

Retell, Vapi, ElevenLabs, LiveKit, Bland AI and Synthflow are supported via Bring Your Own Carrier.

Is there a free trial?

The account is live from signup with free credits, no payment required. Add a free test DID on request. No commitment for the first 30 days.

What is the difference between UK SIP termination and UK DID numbers?

UK SIP termination is used for outbound calls to UK fixed, mobile, toll-free and NGN destinations. UK DID numbers are inbound numbers that let customers call you on a local, national or toll-free UK number.

Can I use didlogic as a backup UK SIP trunk?

Yes. You can route a traffic slice, backup route or overflow traffic through didlogic before moving full production volume.

Do I need a UK company to buy UK numbers?

No UK office is required for many UK geographic number use cases, but account verification and number-use requirements may apply.

Get started free

Free test DID on request, no payment required, no commitment for 30 days.