Whether you're managing a single office or multiple locations across the country, our SIP trunk solutions provide reliable, high-quality voice communications that integrate seamlessly with your existing IP-enabled phone system.
With the PSTN network scheduled for shutdown in 2027, migrating to SIP trunking isn't just smart business, it's essential for future-proofing your communications infrastructure.
Alternatively if you would to speak to one of our specialists you can contact us at:
0116 509 5000 | hello@cicigroup.co.uk
What is SIP Trunking?
SIP trunking creates a virtual connection between your business phone system (PBX) and the public telephone network using your internet connection.
It replaces traditional phone lines with digital channels that can handle multiple simultaneous calls, all while reducing costs and increasing flexibility.
Think of it as the bridge that connects your modern IP phone system to both traditional phone numbers and the wider world of internet-based communications.
Powerful Features for Modern Business
Our SIP trunking service delivers enterprise-grade capabilities designed to give your business complete control over its communications. From intelligent call routing to built-in disaster recovery, every feature is engineered to keep your team connected, productive, and responsive to customer needs, no matter where they're working or how fast you're growing.
Add or remove channels instantly to match your business needs. Scale from two channels for a small office to hundreds for large enterprises and contact centres, all without physical installation or lengthy delays.
Take control with sophisticated call routing, automated failover, and comprehensive number management. Route calls intelligently based on time, availability, or caller identity to ensure customers always reach the right person.
Choose phone numbers from any location regardless of where your business is physically based. Present local numbers to customers in different regions, maintain your existing numbers when relocating, or establish an international presence without opening overseas offices.
Never miss important calls with automatic failover and disaster recovery. If your primary connection fails, calls automatically reroute to backup locations, mobile devices, or alternative sites, ensuring business continuity even during emergencies.
Rest easy with enterprise-grade security features including fraud detection, IP whitelisting, and real-time monitoring. Our systems actively watch for suspicious activity and alert you immediately to potential threats.
Works seamlessly with your existing IP PBX or hosted phone system. No need for expensive hardware upgrades, if your system supports SIP, you can be up and running within 48 hours.
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Is SIP Trunking Right for Your Business?
SIP trunking is ideal for businesses that want to retain their existing IP PBX investment while gaining the benefits of modern, internet-based telephony. It's particularly well-suited for:
Connect multiple offices with a unified communications system. Route calls between sites for free, present a consistent front to customers, and manage everything from a central location.
Contact centres, sales teams, and customer support departments benefit from the scalability and cost-effectiveness of SIP. Handle hundreds of concurrent calls with ease while keeping costs predictable.
Businesses experiencing rapid growth need communications that can keep pace. Add new team members, open new locations, or expand into new markets without the constraints of traditional phone lines.
Reduce telecommunications spending significantly while maintaining or improving service quality. The savings from switching to SIP often pay for the migration within the first year.
Rapid Deployment
Get connected fast with virtual setup requiring no physical installation. New sites operational within 48 hours.
Instant Scalability
Add or remove channels as needed with a few clicks. Scale up or down without hardware changes.
Global Reach
Establish presence anywhere with local and international numbers. Manage all calls centrally from one location.
Simplified Management
Control everything from one portal. Manage numbers, routing, and statistics instantly without support calls.
Enhanced Reliability
Benefit from 99.9%+ uptime on carrier-grade infrastructure. Redundant connections keep your business online.
Dramatic Cost Savings
Cut telephony costs by up to 50% versus traditional ISDN. Enjoy lower call rates and pay only for what you use.
Frequently Asked Questions
Here you can find some of the most common questions we receive.
SIP trunking requires a reliable broadband connection with sufficient bandwidth. Each concurrent call requires approximately 100kbps of bandwidth. For best results, we recommend business-grade broadband with at least 10Mbps download and 2Mbps upload speeds for small offices, scaling up based on your channel count. Quality of Service (QoS) configuration on your network helps prioritise voice traffic for optimal call quality.
Absolutely! We can port your existing numbers to our SIP trunk service, ensuring business continuity and avoiding the cost and disruption of changing your published contact information. The porting process typically takes 1-2 weeks and we manage the entire process for you.
Business continuity is built into SIP trunking. You can configure automatic failover to redirect calls to mobile phones, alternative sites, or even traditional PSTN lines if needed. Many businesses maintain a backup connection or use 4G/5G failover to ensure calls always get through, even during internet outages.
When properly configured with adequate bandwidth and QoS, SIP trunk call quality equals or exceeds traditional lines. Many customers report even better clarity with HD voice codecs. The key is having a quality internet connection and properly configured network equipment.
For new numbers, setup can be completed within 24-48 hours. If you're porting existing numbers, allow 1-2 weeks for the porting process. Installation is straightforward—we provide you with configuration details and can assist your IT team or contractors with the technical setup.
You'll need an IP PBX (phone system) that supports SIP trunking and IP phones or SIP-compatible handsets. If you have an older PBX, you may need a SIP gateway or license upgrade. Many businesses take this opportunity to upgrade to a modern cloud-hosted phone system for maximum flexibility.
Yes! SIP trunking offers competitive international calling rates, often significantly cheaper than traditional telephone services. You can also provision international numbers to present a local presence in other countries while routing calls to your UK office.
Get started today!
Our team of experts are ready to help you migrate to SIP trunking with minimal disruption and maximum savings.
