SIP Trunk UK | ISDN & Analogue SIP Replacement

Reliable, cost-effective phone lines with 24/7 support and options to add extra call features. SIP Trunking is the first step of moving your business communications to the cloud.

Is it time for you to upgrade to SIP?

Never miss a call and stay connected with your customers, suppliers and people with our tailored business phone line services. From business landline products to SIP trunking, our reliable, cost-effective business phone lines, with helpful call features, come with excellent customer support and are perfect for any size company. Or if you’re ready to move to IP telephony, as lines and calls providers, we can support you to ensure minimum disruption with our scalable SIP trunking services.

SIP Trunk UK

SIP Trunk is a gateway into the cloud. It uses your current phone system but makes it run like a hosted voice solution. It’s resilient, cost-effective and, with the PSTN network being switched off in 2025, a SIP Trunking solution means you’ll be future-proofing your business.

Inbound Numbers

With inbound numbers there’s no such thing as geographic restrictions. What’s more, you can choose a memorable number to maximise the return on your advertising and marketing campaigns.

There’s also an added security element as, by porting your numbers into our network, we ensure your calls are re-routed should the line be engaged or in case of an emergency.

Calls can also be diverted to landlines or mobiles of your choice which can be changed at anytime through our online portal, allowing your business complete control and flexibility.


We offer expert support to help you move from line rental and ISDN services to internet-based solutions such as VoIP and SIP. We’re one of only a small number of UK providers that are actively part of industry planning meetings regarding the PSTN switch off, so you know you’re in safe hands.

Phone lines for the office

ISDN to SIP upgrades

World-Class Value

We’re an independent provider meaning we aggregate the best voice services from the major suppliers, including Openreach, BT, TalkTalk and Gamma. Combined with our unique commercial agreements, we’ll get you the most competitive prices in the marketplace.

Save Time

We have the knowledge and experience to help you quickly and painlessly upgrade from ISDN to SIP

Creative Solutions

With no two businesses the same, get the mix of phone connectivity best suited to your needs.

We work with

Why you should choose PRP

It's no longer the case that technology innovation benefits corporate business. The accessibility of technology to businesses of any size means that everyone can get an edge with their operation by having efficient and effective solutions which make companies more profitable.


We combine straightforward solutions, including fibre broadband, mobile tariffs and phone systems, with friendly, helpful people to support businesses with their communications needs, now and as they grow.


As an independent provider, we work with all of the major telecommunications networks and suppliers, meaning we’ll always get the best deal in the market for our customers.


Our journey began in 2003 when PRP was founded and, pretty quickly, we got to grips the the huge growth in communications products and services. We've seen first hand how technology can transform.

Our phone line services are the perfect solution for you, lets go.