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SIP trunking that cuts call costs and scales on demand
Connect your existing phone system to the cloud over the internet — keep your numbers, add or remove channels instantly, and stay online through any outage. Fully managed by our London team.
Your PBX
on-prem or cloud
SIP trunk
virtual channels
PSTN & mobile
145+ countries
› what is sip trunking
Your phone system, delivered over the internet
A SIP trunk replaces the old physical phone lines (ISDN/PSTN) with a secure virtual connection between your phone system and the public telephone network — carried over your internet or a dedicated circuit.
That means no more copper lines or per-line rental. You buy exactly the number of concurrent calls (channels) you need, add more in minutes for busy periods, and route calls intelligently across sites and to mobiles.
- No physical lines or line rental
- One provider for numbers, calls & support
- Route calls across every site
- Instant capacity for peaks & campaigns
Inbound call
arrives on your number
SIP trunk
routes to your PBX over IP
Your team
answers on desk phone, app or Teams
No answer?
reroutes to another site or mobile
The PSTN & ISDN switch-off is coming
Openreach is retiring the traditional PSTN and ISDN network across the UK by 2027 — after which analogue and ISDN lines stop working. SIP trunking is the direct, cost-saving replacement, and we handle the whole migration for you.
› why sip trunking
Everything a modern business phone connection should be
Lower running costs
Drop expensive line rental and cut call charges — especially on long-distance and inter-site calls, which stay on-net and free.
Scale instantly
Add or remove channels in minutes as your team grows or a campaign spikes. Never pay for capacity you don't use.
Business continuity
If a site or line goes down, calls reroute automatically to another site, a mobile or voicemail — so you never miss a call.
Keep your numbers
Port your existing geographic and non-geographic numbers, or add new local numbers in 145+ countries.
Works with your PBX
Connect your on-prem or cloud PBX — 3CX, Asterisk, FreePBX, Cisco, Avaya, Yeastar and more, or Microsoft Teams via Direct Routing.
Secure by design
Encrypted signalling and media (TLS/SRTP), fraud monitoring and per-channel call limits protect you from toll fraud and abuse.
› isdn vs sip
Traditional lines vs SIP trunking
| ISDN / PSTN | SIP trunk | |
|---|---|---|
| Line rental | Per physical line | None — virtual channels |
| Scaling | Weeks, engineer visit | Minutes, self-service |
| Inter-site & long-distance | Charged per minute | On-net / greatly reduced |
| Disaster recovery | Tied to the building | Instant reroute anywhere |
| Number porting | Limited & slow | Fast, keep every number |
| Future-proof | Retiring by 2027 | The modern standard |
› compatibility
Connects to the phone system you already run
Vendor-agnostic SIP trunks that plug into virtually any modern PBX — on-premise or in the cloud.
› how we deliver
Migrated and managed, end to end
Assess
We review your current lines, numbers, call volumes and PBX, then size the right number of channels.
Provision & port
We provision the trunk, arrange number porting with zero downtime and set up call routing and failover.
Configure
We connect and tune your PBX, apply security policies and test every inbound and outbound scenario.
Go live & monitor
You cut over seamlessly, and our London team monitors quality, capacity and fraud 24/7.
› get a quote
Get a SIP trunk quote
Tell us about your current setup and a specialist will size your channels, plan the number porting and quote you a fully-managed SIP trunk — with a clear migration plan for the PSTN switch-off.
- Free migration & porting plan
- Keep every number
- UK-based support
- No idle-capacity charges
› faq
SIP trunking, answered
Related services
› let's talk
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