SIP trunks
Keep your on-site phone system but replace the ISDN or analogue lines behind it. SIP trunks carry calls over your data connection, with channels you can add on demand.
If you have invested in a PBX that still has years of life, SIP trunking is the most cost-effective way to keep it working after the PSTN and ISDN networks close. Your numbers are ported to our network and calls run over a broadband or leased line connection.
Channels can be added or removed monthly, overflow can route to mobiles if your connection fails, and you get detailed call records for every number.
What is included
Wide PBX support
Works with most modern IP and hybrid PBX systems from common manufacturers.
Flexible channels
Scale concurrent call capacity up or down.
Disaster recovery
Automatic rerouting if your site goes offline.
Number porting
Bring your DDI ranges across from ISDN.
Inclusive minutes
Bundles for UK landline and mobile calls.
Fraud protection
Spend limits and destination controls.
How we set it up
Check your PBX compatibility and connection.
Order trunks and port numbers.
Configure and test with your maintainer.
Switch over on the port date.
Who it suits
- Replacing ISDN30 or ISDN2
- Keeping a recent on-site PBX
- Multi-site PBX networks
- Contact centres with existing hardware
Guide price
From£5per channel / month
Excludes VAT. Your quote depends on users, numbers and call volumes.
SIP trunks across the UK
We deliver sip trunks to businesses throughout England, Scotland, Wales and Northern Ireland. Popular locations include:
Questions we get asked
Something else on your mind? Call 020 7112 8558 or send us a message and a telecoms specialist will reply.
Will SIP trunks work with my PBX?
Most IP-capable PBXs support SIP. Older systems may need a gateway or a software upgrade. We check before you order.
How much bandwidth do I need?
Roughly 100 kbps per concurrent call each way with G.711. A 30-channel trunk needs about 3 Mbps symmetrical with headroom.
Get a quote for sip trunks
Tell us how your business takes calls today and we will recommend a setup, with a clear monthly price. Most quotes are ready the same day.
- UK-based support team
- Free setup and number porting on most plans
- Monthly rolling options available
- No obligation quote
Prefer to talk? Call 020 7112 8558, Monday to Friday, 9am to 5.30pm.