TelephonySIP Trunk Lines

SIP Trunking offers organisations the ability to move from traditional dispersed voice network architecture to a more centralised and cost efficient VoIP based solution.

Nowadays most modern telephone systems have an extra way of connecting to the outside world. This is generally known as a SIP Trunk. SIP Trunking is the Next Generation Network (NGN) and offers a future roadmap to additional features and multimedia services.

Our SIP Trunks are a genuine alternative to ISDN - with us providing a managed service covering the connectivity, SIP trunks and number management – exactly the same as with ISDN. The service provides a highly exible alternative to ISDN solutions and is designed to work successfully with all the leading IP PBX brands in the UK market, giving you peace of mind in knowing that your PBX hardware works with the network service.

With older systems that might not be IP enabled we can provide you with a gateway device which converts traditional ISDN based phone systems to SIP. One of the main reasons for people switching to SIP is the cost savings, but that’s not where the benefits stop. Our SIP Trunks allow for complete scalability, we can supply everything from 1-100,000 channels in one provision. This means that unlike ISDN no extra cards, copper or contracts once you reach your limit.

Benefits of our SIP trunks

Compared to ISDN, SIP Trunks are cheaper to setup and run
Free calls to UK geographic numbers (numbers starting with 01, 02 and 03)
Free calls to UK mobiles (subject to 3 year contract) .
More flexible in terms of what telephone numbers you can have and where you can have them
Quicker to setup and make changes to the service than traditional telephone lines
Excellent solution for Disaster Recovery (DR) and Business Contunuity (BC)


Some of our packagesOther packages are available


SIP 10
Included in this package
SIP Assured 10
Included in this package
Converged 30
Included in this package

All of our SIP packages include

Free UK geographic calls Call Line Presentation (CLI) rental
DDI rental Fraud protection
Free calls to UK mobiles (subject to 3 year contract)



Our SIP Trunks are fully tested and compliant with Skype for Business. This provides a direct connection from the Business SIP Trunks to your Skype for Business environment which allows you to make and receive external calls

Our SIP Trunks have been conformance tested with all of the UK’s leading IP PBX manufacturers such as Mitel, Avaya, Microsoft and Cisco

Sip Systems

SIP Trunk solutions offer robust business continuity options not available on ISDN to ensure your business never loses any calls. The active/standby and load sharing SIP Trunk solutions are designed to cope with any potential downtime situation; whether you need to keep your organisation running during an unplanned emergency without the high cost of call forwarding or simply need to balance call volumes between sites during busy periods, Our ‘resilient design’ SIP Trunk solutions deliver the continuity of service you need to keep your business operational whatever the circumstances.