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VoIP Trunks, also known as SIP Trunks, are an essential solution for businesses looking to modernize their communication systems. With the UK scheduled to shut down its traditional ISDN (Integrated Services Digital Network) lines by 2025, now is the ideal time for businesses to transition to a VoIP-based telephony system.
At MSP247, we provide cost-effective and reliable VoIP solutions tailored to meet the dynamic needs of businesses. By upgrading to VoIP Trunks, businesses can future-proof their communication systems, ensuring compliance with modern standards while enjoying enhanced flexibility, cost savings, and scalability.
This proactive shift not only prevents service disruption post-ISDN but also unlocks a range of advanced features that traditional systems cannot offer. Let MSP247 guide you through this vital transition with our expert support and tailored VoIP solutions.

VoIP Trunks, or SIP Trunks, are digital lines that use the internet to transmit voice calls instead of traditional telephone lines. They are a vital part of any modern telephony infrastructure, enabling businesses to connect their Private Branch Exchange (PBX) systems to the global telephone network.
VoIP Trunks leverage the SIP (Session Initiation Protocol) to establish, manage, and terminate voice and video calls. This technology integrates seamlessly with your existing PBX, enabling efficient communication by routing calls via high-speed internet instead of traditional ISDN lines.
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To set up VoIP Trunks for your business, you need:
At MSP247, we specialize in delivering tailored VoIP Trunk solutions that align with your business goals. Here’s why businesses choose us:
Expertise: Decades of experience in telecommunication services.
Support: 24/7 customer support for uninterrupted communication.
Custom Solutions: Plans tailored to your specific business needs.
A VoIP trunk is a communication channel that connects a business's phone system (PBX) to the internet. It allows voice calls, video calls, and data to be transmitted over IP networks rather than traditional phone lines, providing cost savings and scalability.
VoIP trunking works by converting analogue voice signals into digital packets that are transmitted over the internet using the SIP (Session Initiation Protocol). These packets are then routed to the destination, whether it's a phone, computer, or another PBX.
SIP (Session Initiation Protocol) is the protocol used in VoIP trunking to initiate, manage, and terminate voice and video calls over the internet. It’s a key component of VoIP that ensures calls are routed to the correct destination.
VoIP calls require approximately 64 kbps per call for good quality. For a business expecting 20 concurrent calls, a minimum of 1.5 Mbps upload and download speed is recommended. Adding a buffer for other internet traffic is advisable.
Yes, most VoIP providers offer number porting, which allows businesses to retain their existing phone numbers when switching to VoIP. The process can take a few days to complete.
Call quality is maintained using technologies such as:
Yes, VoIP trunks can seamlessly integrate with cloud-based PBX systems. This setup offers flexibility, as businesses can manage their communication system remotely while using VoIP trunks to handle the voice traffic.
A practical technology partner
MSP247 brings day-to-day support, security, connectivity and planning together so your team has one accountable route for help.
Windows, Mac, iPhone, iPad, Chromebook, servers, networks and cloud services supported as one working environment.
Responsive remote support with planned on-site assistance across York, Leeds and the wider Yorkshire region.
Responsibilities, priorities, escalation routes and available response arrangements are explained before service begins.
Accounts, devices, backups and connectivity resilience are reviewed together instead of as isolated products.