SIP (or Session Initiation Protocol) – also known as SIP trunking – is our market-leading and cost-effective replacement for traditional ISDN.  It connects your ‘ PBX’ telephone system to the PSTN network via a managed broadband or leased line Ethernet or private circuit network

Can I have SIP Trunking in my business?

Any business with a PBX telephone system can switch or upgrade to a SIP trunking service and immediately benefit from a more flexible, less expensive and more resilient phone service


SIP Trunking Popularity Grows.

What has typically been used to make a phone call, or carry voice traffic, is called the Public Switched Telephone Network (PSTN). PSTN traffic includes, Analogue and ISDN lines, however, with the advent of VoIP (Voice over Internet Protocol) telephony is moving from PSTN to much more modern and flexible ‘Session Internet Protocol’ trunks or SIP trunks.

All the large telecom providers are in the process of phasing out the older ISDN  functionality, and are moving customers to IP. Most businesses are moving to a SIP trunk which will also include a phone system upgrade.

In the UK ISDN lines are down and SIP lines are up !

In the UK, ISDN lines are down to less than 3 million lines, from 4.7 million lines in 2007 and the trend is growing. By 2018 major telcos such as  France Télécom, Deutsche Telekom and Telecom Italia will no longer offer ISDN lines as they will eventually ceased to be provided and this is also the case with BT who plan to stop supporting ISDN lines in the early 2020’s

As a result, Session Initiation Protocol (SIP) trunking has increased by 62 percent in 2016 from 2015 More and more businesses are deploying the technology to access the benefits it offers.SIP lines are fast replacing traditional ISDN lines as BT are phasing out this service. If a client has multiple sites, calls between the sites via SIP trunks are free of charge.