SIP trunking
Swap the phone line, keep the phone system
Move beyond traditional phone lines without replacing the hardware or numbers your business already uses.
What is SIP trunking?
SIP trunking enables your existing phone system to deliver calling capabilities digitally instead of over traditional phone lines.
Because it’s a digital solution, you’re able to keep using the deskphones you know and love even after January’s analogue switch-off – while getting a few extra benefits like usage reports and call configure.
It’s a more basic alternative to cloud-based phone systems, great for those who don’t want to fully migrate systems.
How does SIP trunking work?
SIP trunking uses your existing deskphones and internet connectivity to provide calling capabilities – keeping your hardware and maintenance simple.
SIP trunking also offers an online portal where you can view and manage features like call routing, call diverts and detailed usage reports – making it easier to manage how calls are handled across your business, without having to replace all your hardware.
What to expect with SIP trunking
Will you lose communications in the PSTN switch-off?
The nation’s landline telephone network is being permanently switched off – every UK business must have a digital solution ahead of January 2027.
Our unified communications solutions, including SIP trunking, operate over the internet rather than the traditional network, protecting your business continuity against the shutdown.
You can even keep your existing numbers when you move, so switching doesn’t mean starting again.
SIP trunking FAQs
What are the requirements for SIP trunking?
You’ll need a good, reliable internet connection, and your existing phone system needs to be compatible. Most modern business phone systems already are. If you’re not sure, our team can check for you.
What's the difference between SIP trunking and a cloud-based phone system?
With SIP trunking you keep your phone systems and private branch exchange (PBX), connecting them to the internet instead of traditional phone lines. You still own and manage your hardware.
Cloud-based phone systems also operate over your existing internet connection, but you’ll typically get new phone systems with built-in software that gives you access to a variety of communications solutions, including calling as well as video, messaging, emails and more. Because these features are hosted in the cloud, you can access them not only from your deskphone but also from your mobile or computer. All the hardware, software and PBX is securely hosted and managed externally to your business, reducing your hardware and maintenance costs. This could be a better fit if you’re looking for more flexibility, additional features or a more modern way to manage business calls.
Can I keep my existing numbers?
Yes, you should be able to maintain your existing phone numbers.
Can Microsoft Teams integrate with SIP trunking?
Yes. Teams can integrate with SIP trunking, adding features like call recording, call routing and voicemail to your existing Teams collaboration tools. We’ve got different ways to set this up – get in touch to find the right one for your setup.
How much does SIP trunking cost?
The cost depends on how many channels you need and your typical call volumes, so tell us how your business calls and we’ll put together a quote.