Multitech Gateways. HST supply the Multitech gateway products. These allow existing non-VoIP PBX's to be converted for the purpose of making VoIP calls across the internet. There are versions to connect to analogue, ISDN 2 and ISDN 30 PBX's.
Contact Hugh Symons Telecom
Telephone: 0870 849 0226
http://www.hughsymonstelecom.co.uk/