Welcome to NumberGroup. We are an Ofcom licensed telecommunications carrier of wholesale SIP Trunking, DDI telephone numbering and innovative IVR applications for the call centre and telecom channel markets.

NumberGroup SIP Trunking offers business quality, jitter free speech, fully tested with a range of popular PBX systems with built-in PSTN failover, NAT Traversal support, a wide range of voice codecs and secure voice encryption. SIP Trunking is provided free of charge offering unlimited concurrent channels and industry leading call rates.

Our telephone number ranges are allocated directly from Ofcom, giving you number security and porting rights. We have a wide range of numbering types available at various retail price points, from Freephone 0800 Numbers, 03/08 Business ranges, 01/02 Local geographic area codes and 09 Premium rate.

A powerful suite of network based IVR solutions providing turnkey services to increase call centre efficiency and customised to solve specific business related problems, all self managed through our Web 2.0 customer portal or API.

Wholesale Solutions

We provide a dedicated managed program for all Resellers, PBX dealers and Channel Partners with bespoke pricing and Service Level Agreements. Please use our contact page for making preliminary contact regarding contractual terms and system evaluating.