SIP Trunking

Evolve voice services and make cost savings compared to ISDN

Flexible voice and data connectivity

SIP Trunks are more cost effective than traditional connections to the public telephone network, such as ISDN.  

They’re more flexible, easily adapting to changes in demand, or resilience requirements.  And they’ll flex, as your organisation or locations change.

Get in touch

10+ employees, Enterprise and Public Sector

Call us at0800 955 5590

Why choose SIP Trunking?

Control your monthly spend

Choose from our three simple packages. They all help you to budget for voice calls easily.

Cut cost and complexity

Rationalise your telephony estate. Centralise to a single PBX, eliminate multiple ISDN lines and make more efficient use of your telephony capacity.

We can help you scale 

Whatever your business need, we can help you grow and support all your fixed, mobile, voice and data requirements.

Flex to meet demand 

It’s easy to add and remove telephony capacity to adapt to busy periods, campaigns or special events.

Get a range of connectivity options 

We offer multiple connectivity options. And work with you to choose the best one for your business

Breeze through business moves

Moving offices? No problem. There’s no need to change your numbers, so you won’t have to worry about the cost of call forwarding or stationery updates. 

SIP Trunking from O2

Replace ISDN and traditional phone lines

Which package is right for you?

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Price per minute

SIP Trunking

Perfect if you have fairly stable demand levels.

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    No monthly commitment and no need to buy a minute bundle
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    Pay for all calls at an agreed PPM rate
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UK domestic bundle

SIP Trunking

Ideal for maintaining a consistent spend on your domestic landline calls

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    Inclusive calls to 01, 02 and 03 landline numbers
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    Subject to a 5,000 minutes per channel, per month fair usage policy
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UK domestic and mobile bundle

SIP Trunking

Ideal if you have a significant base of mobile users.

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    Inclusive calls to 01, 02 and 03 (landline) and 07 (mobile) numbers
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    Three-year contract term 
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    Subject to a 2,000 minutes per channel, per month fair usage policy

A little bit more info

O2 SIP Trunking for medium sized businesses

Read more about O2 SIP Trunking for medium sized businesses 

O2 SIP Trunking for larger businesses

Read more about O2 SIP Trunking for larger businesses.

O2 SIP Trunking tariff

Get more information the O2 SIP Trunking tariff here including voice termination rates

O2 SIP Trunking price list.

Download the latest O2 SIP Trunking price list, including pricing for SIP channels, New numbers, Porting Numbers and the minute bundle options.