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SIP Trunking for Business

SIP trunking stands for Session Initiation Protocol and is a telephony technology that enables businesses to make and manage voice calls, and other unified communications services, over the internet. Essentially, SIP trunks are virtual phone lines that enable users to make and receive phone calls over the internet to anyone in the world. With the impending ‘Big Switch Off’ of the public switched telephone network (PTSN), SIP trunking is rapidly replacing traditional ISDN lines. It connects PBX to the PSTN via broadband, ethernet or private circuit into our national network.

Ultimately, it provides your business with peace of mind that your PBX hardware works with the network service, preparing you for the future, offering a cheaper alternative to many traditional phone lines and guaranteeing a secure phone network. SIP trunking technology is suitable for any business from small scale set-ups to enterprise organisations and - as a leading provider of SIP trunking solutions - Focus Group is ready to deliver the huge benefits of the ‘SIP switch’ to your business.

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What are the benefits of SIP trunking?

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Scale up and down when you want

SIP trunking scales with your business. SIP trunks are perfect if you are looking to move premises, upsize, or downsize and want to keep using your current number. Scale up lines during busy periods and back down again afterwards. You can add lines, take them away, split calls at any time. You are always in control.

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Save money on call costs and line rental

SIP trunking can deliver less costly, more reliable connectivity than ISDN over an IP connection. It can save up to 50% on phone line rentals and 25% or more on call costs.

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Compatible with Skype for Business

Our SIP trunks are integration tested and approved to interoperate with Microsoft Skype for business, allowing you to directly connect to the platform to make external calls.

SIP Trunk Features

In Office & at home

Perfect for medium or large organisations with multiple sites, not only will you save on your line rental and call costs, but you'll get free internal calls within your organisation and a whole host of great features. Converting your phone line also allows for more flexibility for those in your organisation that work from home.

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Woman making a SIP trunking call on a headset

SIP Trunk call manager

SIP trunking manager allows for business continuity as standard, giving you the ability to manage all your numbers, regardless of geographical location, and all aspects of your inbound calls onto a single platform, meaning that you will never miss a call again.

SIP trunk call manager

SIP Trunk Call recording

Our SIP trunking solutions allow you to record all calls coming into and out of the business. Meaning that you can use call recording to improve staff performance and increase customer satisfaction.

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Cost Effective

SIP for business delivers less costly, more reliable connectivity than ISDN over an IP connection. It can save up to 50% on line rentals and 25% or more on call costs, making it an easy choice for anyone looking to upgrade their phone systems.

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SIP trunking packages

SIP Trunk Basic

from £5.99/pm


  • ✔  2 - 50 channels
  • ✔  Unlimited DDI's
  • ✔  No minimum call charge
  • ✔  Competitive call rates
  • ✔  No connection free

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SIP Trunk Premium

from £19.99/pm


  • ✔  8+ channels
  • ✔  Unlimited DDI's
  • ✔  No minimum call charge
  • ✔  Competitive call rates
  • ✔  No connection free

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Frequently asked questions

Business SIP trunking allows for phone calls over the Internet using cloud hosted telephony, instead of using traditional copper phone lines. A SIP trunk provides access to the Public Switched Telephone Network (PSTN) over the Internet, while providing a more flexibile and lower cost inbound and outbound call solution.

VoIP is Voice over Internet Protocol. It is a technology that allows a user to make phone calls through internet instead of a regular landline or a mobile network where as SIP connects on-premise PBX to the PTSN via broadband, ethernet or private circuit into our national network.

SIP (Session Initiation Protocol) trunks allow businesses to make and receive phone calls over the internet instead of traditional phone lines. This method offers greater flexibility, cost savings, and scalability compared to conventional telephony systems. SIP trunks are used to connect a business's private branch exchange (PBX) to the internet, enabling seamless voice communication and other unified communication services.

SIP trunking works by using the Session Initiation Protocol (SIP) to establish and manage voice calls over the internet. It connects a business's PBX (Private Branch Exchange) to the internet via a SIP trunk provider, replacing traditional phone lines. When a call is made, the PBX converts the voice signals into data packets, which are then transmitted over the internet to the SIP trunk provider. The provider routes these packets to the recipient's phone network, converting them back into voice signals. This process allows businesses to make and receive calls globally, benefiting from cost savings, scalability, and enhanced communication features.

On-premise PBX (Private Branch Exchange) is a system that connects individual desk extensions to telephone lines and mobile networks. SIP enabled PBX is a PBX that can connect to the internet and use SIP to make calls over the internet.

Focus Group SIP Trunks are suitable for any size of business from small businesses to large enterprises and government organisations that currently have a PBX, unified communications solution or key system.

Yes, you need a PBX (Private Branch Exchange) for a SIP trunk. The PBX serves as the central switching system for calls within a business, and when integrated with a SIP trunk, it allows the PBX to connect to the internet for making and receiving external calls. This setup leverages the benefits of VoIP technology, providing cost savings, flexibility, and additional features like unified communications. Without a PBX, a SIP trunk cannot function effectively, as the PBX manages the routing and handling of all calls.

No, a SIP trunk is not a physical connection. Instead, it is a virtual connection that uses the internet to transmit voice, video, and other communication data. SIP (Session Initiation Protocol) trunks replace traditional physical phone lines by creating a virtual phone line over an internet connection, enabling businesses to make and receive calls through their Private Branch Exchange (PBX) systems. This virtual nature allows for greater flexibility, scalability, and cost efficiency compared to conventional telephony methods.

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Customer stories

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Brewers

Brewers, with over 150 retail locations, streamlined its network services in order to provide an enhanced customer experience.

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Somerset House

Focus Group guided Somerset House through the adoption of a cloud-first strategy to enable a future-proof digital transformation.

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ConSol Partners

ConSol Partners increased its productivity, with a robust hosted telephony system and a fully maintained IT infrastructure.

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