SIP Trunks
The cost-effective, flexible alternative to ISDN. Our SIP trunks work seamlessly with each of the leading IP PBX brands in the UK market.Â
SIP Trunks Supplier
SIP trunks (Session Initiation Protocol) is a more flexible alternative to ISDN, with a lower cost, for inbound and outbound voice calls. While being quicker to install, and provision, SIP also gives your business stronger continuity.
With end-to-end communication SIP is an established way to move your PBX system to the cloud.
Unlike traditional phone lines SIP uses internet or a third party IP network, making your calls local again and drastically reducing costs.
- 50% reduction on call costs
- From £5 per channel


SIP Solutions for your business
If you are a small to large business, there is no need to worry about SIP capacity. From a small PBX of two lines to large call centres SIP trunks are completely scalable. SIP combines both voice and data into a single network making it easier for your employees to work remotely.
With a new monthly SIP plan in place you will instantly see the ROI on your communication costs.
SIP Trunks - Why Choose IBT?
Savings
Flexibility
Control
Future Proofing
Contingency
Compatibility
1200+ UK companies use IBT for their communications
Always available, resolving matters promptly. Excellent Service. Cheers 🙂
We partner with the best
Frequently asked questions
For tailored information, contact us directly and we will happily answer any questions you may have.
Contact usCan I have SIP installed for my business?
Any business with a PBX can switch to a SIP trunking service. You will immediately benefit from a more flexible, less expensive and more resilient phone service.
What is SIP?
SIP Trunking is a standards-based replacement for traditional ISDN. It connects your PBX to the PSTN via broadband, Ethernet or a private circuit into our national network. SIP Trunks work seamlessly with each of the leading IP PBX brands in the UK market.
What does SIP stand for?