SIP trunks

What is SIP?

Session Initiation Protocol, or SIP, allows for VoIP (Voice over Internet Protocol) between two endpoints and uing SIP connects your telephone system (PBX) to the PSTN (Public Switched Telephone Network).  There’s a lot of a intialism in the telecoms world, so to put it simply a SIP trunk is the virtual version of a traditional analog telephone line.  By connecting one, two or many more SIP trunks to your PBX you can make local, national and international concurrent calls over the internet with low rental and call costs, and enhanced resiliency.

Future-proof your business with our SIP trunking services

SIP is the next logical step in the evolution of voice communications, with voice calls over the internet providing additional features over and above traditional ISDN and analogue lines, which are being switched off by BT Openreach in 2025.

As leading smart business communications specialists, TSI provide several SIP trunking solutions that can support connections, ranging from one channel for businesses with small PBXs, to an unlimited number of channels, which are often found in larger businesses and contact centres.

Replace your traditional ISDN lines with SIP and benefit from:

Cost savings – IP connectivity costs less than ISDN, with lower call costs, free internal calls between extensions and offices (including international calls) and lower line rental costs for multiple sites.
Greater flexibility – move office and keep your geographic number without any on-going call forwarding costs and potentially no, or reduced, costs associated with new company stationery.
Business continuity – temporarily relocate your office quickly and cost effectively.
Line rationalisation – reduce the number of ISDN lines you have, as well as the number of PBXs you need to maintain and retain full control of all of the numbers associated with your business.
Scalability – increase or decrease your number of SIP trunks quickly and seamlessly during busy or quiet periods.
Resilience – 100% up time means you can keep your business running without expensive call forwarding costs in a disaster or load balance your calls between sites during peak hours.