SIP Trunking

One of the UK’s leading Business VoIP and SIP specialists, providing all the products and services you need when you’re ready to make the leap and move your telephone communications to IP and next-generation communications.

About SIP Trunking

We provide a high quality SIP Trunking service connecting your PBX directly into our network, via an DSL or Ethernet IP connection to receive and terminate your voice calls over the public telephone network.

This service provides a highly flexible alternative to ISDN and has been fully tested with many leading IP PBX applications such as Asterisk, Avaya, 3CX, Freeswitch and SNOM.

Our free SIP trunking service offers access to our industry beating call rates with an unlimited number of concurrent channels and built-in PSTN failover. Unlike other providers, we don't charge per channel or trunk, so on a 100 channel system, you could save £500 or more per month!

The following voice and video codecs are supported: PCMA/U, G722, G722.1, CELT, GSM, Speex, iLBC, G729, G711a, G711u and T.38 fax. Our network supports both PBX equipment and individual SIP Phones as well as VoIP Software packages on PCs. We also support NAT Traversal, Voice encryption and access from mobile phones.

We provide high strength encryption of both signalling and media to suit the needs of government and public sector operations, compatible with most commercial IP PBX and SIP phones.

Overview of SIP Trunking


  • Unlimited number of channels
  • No charge per channel
  • Wide range of codecs
  • Compatible with most VoIP systems
  • Take advantage of low rates
  • No long contracts
  • Excellent ISDN replacement