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SIP Trunks & VoIP

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SIP Trunks are the latest in Voice over IP (VoIP) technology. A SIP Trunk is an alternative to a traditional telephone line. It uses your broadband connection to make and receive telephone calls. These calls are known as 'VoIP' calls.

Why switch to SIP?

A SIP trunk is a very flexible alternative to traditional analogue or ISDN telephone lines. With SIP, there is no need for additional dedicated lines, SIP Trunks can make better use of your existing broadband or data connection.

Advantages of SIP

As with any modern technology, SIP and VoIP has so many benefits.

Prioritising voice

During peak times, SIP Trunks are prioritised over data, meaning that calls will still pass through.

No additional handsets

Another benefit to SIP is that it is able to run on the same handsets - meaning there is no cost to of buying brand new handsets.*

Superior Quality

With a good internet connection, a VoIP voice call will have a higher quality than a traditional telephone lines.

Fast provisioning

SIP Trunks can be provisioned at a much quicker time scale than waiting for an Openreach appointment.


Lines can be easily increased or decreased quickly when needed.

Number retention

Number porting is available to retain your existing recognised telephone numbers. Or you can get a new one.

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*SIP compatible handsets required

Let's break this down.

SIP and VoIP sound more complicated than they really are.

SIP Trunks: Using broadband for voice.

Okay, so you may or may not have heard of 'SIP', 'SIP Trunking', 'SIP Trunks' or 'Session Initiation Protocol'. SIP is a modern method for making and receiving your voice calls using your existing broadband connection.

Normally, a business (or household) has two separate lines:

Telephone line:
To make calls using the office handsets (these lines are analogue or ISDN).

To connect to the world wide web with computers and smartphones (these lines are ethernet or fibre).

With SIP, you eliminate the need for dedicated telephone lines. Completely. Because a SIP Trunk sits on your broadband connection, you can reduce your running costs considerably by removing your telephone line.

With only one line, comes only one bill - multiple costs become one. This is a substantial big advantage of using SIP over a traditional telephone line.

SIP Trunk diagram
VoIP: The future of voice calling.

You may have heard the term 'VoIP' or 'Voice over IP' banded around. VoIP is a type of phone call that uses a digital internet connection rather than an analogue line.

The difference between SIP and VoIP is in their definitions:

VoIP is a type of call.

SIP is a method of making a VoIP call.

It's that simple.

It's so simple, in fact, that VoIP is already a very common feature and you probably already use it. Good examples of a VoIP call would be FaceTime Audio, a WhatsApp call, or a Skype call from a computer.

This technology is now being integrated from computers and mobiles into phone systems. Depending on your internet speed, VoIP can offer a far superior call quality over traditional telephone lines.

With the announcement of the 2025 ISDN Switch off, the plan is for every premises in the country to convert to VoIP only calls, using a UK wide superfast fibre broadband network.

Voice over IP (VoIP) diagram
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