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SIP Trunking

SIP Trunking

The future of the traditional phone line

If you’re making do with ISDN phone lines with your business at the moment, you’re missing out on a cheaper, more resilient and futureproof alternative.

SIP (Session Inanimation Protocol) trunks are virtual phone lines that use your broadband connection to connect your PBX (business phone system) to the traditional phone network. This will become the new standard for phone lines when BT switches off the ISDN network in 2025.

SIP trunks allow you to choose any geographic telephone number – ideal for local marketing campaigns, and they’re much more reliable than ISDN lines which can be hit-and-miss in terms of call quality. They also cost less overall per connection.

Why have SIP trunking?


Cheaper Bills

Save money thanks to unlimited calls to UK landline and mobile numbers.


Number Choice

Choose numbers from any UK area code – great for local marketing campaigns.


Easy Moving

Retain your numbers, avoid missed calls and avoid call forwarding costs if you relocate your business.


Fully Scalable

If your business is seasonal or expanding, you can scale voice channels up or down instantly.


Extra Savings

Save up to 50% on line rentals and 25% or more on call costs compared to traditional ISDN.


Disaster Recovery

Reroute calls to an alternative location quickly and easily if the unexpected happens.


Fraud Protection

No need to panic if you notice unusual usage - you’re covered for fraud at no extra cost.


Quality Calls

With lots more available bandwidth, sound quality is much better than through ISDN.

Plans & Pricing

Swipe across to compare prices

Pay as you go £6.00 per line/ per month Unlimited £10.00 per line/ per month
Number Porting Number Porting Free Number Porting Free
UK Phone Number UK Phone Number £11.25 per number UK Phone Number £11.25 per number
Calling UK Landlines Calling UK Landlines 1p/ per minute Calling UK Landlines Unlimited
Calling UK Mobiles Calling UK Mobiles 1p/ per minute Calling UK Mobiles Unlimited
Calling International Calling International From 3p/ per minute Calling International From 3p/ per minute
Auto Attendant Auto Attendant Auto Attendant
Call Forwarding Call Forwarding Call Forwarding
Call Recording Call Recording £3.50 per month/ per month Call Recording £3.50 per month/ per month

Frequently Asked Questions

Porting numbers can take up to two weeks depending on how many you have. We’ll start the process as soon as you give us the green light and let you know when it’s done.

Get in touch and we can set up extra trunks in a few minutes.

No, you can have as many as you like, from as many locations as you want.

It’s hard to know without testing, but we have a range of broadband options that suit our SIP trunking services. Get in touch to talk about the best option for your business.

This is where SIP trunking really helps. If the worst happens, calls can be automatically re-routed to a different destination.

SIP trunking is quicker to install than ISDN, costs less, and gives you the option of picking a number from any UK location, rather than just local numbers with ISDN.

We proactively monitor and manage quality of service across the entire network, but it’s the underlying network quality of SIP trunks that makes a real difference over ISDN. We can support data hungry G.711 codecs as well as the compressed G.729 codecs which use less bandwidth.

Enquire about SIP Trunking

Fill out this form and we’ll be in touch talk through SIP trunking.

Or call us right now on

0161 763 8801

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