What are SIP Trunks and how do they work?

SIP Trunks, designed to replace traditional phone lines, utilize broadband internet connections to seamlessly connect your business phone system (PBX) to the traditional phone network (PSTN), eliminating the need to replace your existing hardware.
SIP Trunks, or Session Initiation Protocol Trunks, are virtual connections that enable the transmission of voice and other unified communications services over the internet. They replace traditional telephone lines by using the internet to carry voice and data traffic, offering cost savings, scalability, and flexibility for businesses.

SIP trunking delivers better flexibility and cost efficiencies of up to 50% by simply connecting to the phone network via the internet. It may be more budget friendly, but it’s also incredibly reliable – ensuring your calls are never lost through line faults or power cuts. Traditional phone lines are being phased out in 2025, so SIP trunks are the ideal future proof option to protect your business.


  • iconCost Savings
  • iconOne point of contact for any issue
  • iconKeep your existing numbers or choose any with SIP
  • iconScalability
  • iconFlexibility
  • iconImproved Service Levels
  • iconCentralized Management
  • iconGlobal Reach
  • iconIntegration
  • iconQuality of Service (QoS)
  • iconFuture-Proofing
Why SIP Trunks are good for Business?

Why buy from us?

Cost-Effective Solutions
SIP Trunks with competitive pricing, allowing businesses to reduce telecommunication expenses without sacrificing quality.
Security and Compliance
We prioritize security, providing SIP Trunks with robust features to safeguard data and ensure compliance with industry regulations, offering peace of mind to customers.
Advanced Features
Our SIP Trunks offer advanced features like call forwarding, voicemail-to-email, auto-attendants, and virtual phone numbers, empowering modern business communication.
Easy Management
Manage your SIP channels through our easy-to-use centralised portal.
Exceptional Customer Support
At our company, customer satisfaction is top priority, offering exceptional support for setup, maintenance, and troubleshooting, ensuring prompt assistance.
Recommended By 3CX
We are one of only a handful of suppliers to have 3CX preferred status, with a native 3CX integration and set-up.

Specialist SIP services

We offer a wide range of bespoke SIP products to meet your specific requirements.
  • Direct Routing
  • Specialist 3CX SIP
  • High Volume

Use Microsoft Teams as your business phone system. Direct Routing is the process of connecting Microsoft Teams to the traditional phone network, or PSTN. It is an increasingly popular way to turn Teams from a powerful internal communications tool to a full-scale unified communications platform.

We are a market-leading 3CX solutions provider – from onboarding and setup to support and maintenance, we help businesses feel secure when purchasing the 3CX system. Our end-to-end packages all include UK-based support, SIP trunks, connectivity and hardware. Deployed in a highly resilient cloud to guarantee service levels – not included in most suppliers’ standard offering.

We have designed our own high-volume SIP Trunks specifically for customers needing high call-per-second and high channel capacity. Integrating directly with your existing PBX, our high-volume SIP Trunks allows you to take advantage of the cloud-based solutions, without replacing your existing equipment.

Frequently Asked Questions

A SIP trunk is a virtual connection that uses the Session Initiation Protocol (SIP) to establish a voice or multimedia session over the internet. It allows businesses to make and receive calls over an IP network rather than traditional phone lines.

Need sales advice? Call...

020 38 709 800