The MTG series of E1/T1 Digital VoIP Gateway connect VoIP and legacy PSTN networks (legacy PBX or E1/T1 service providers) in a seamless manner, with scalability up to 63 E1 or T1 lines.The MTG series can handle the diverse VoIP needs of SMEs, large organisations, service providers, carriers, and call centres by supporting ISDN PRI, SS7, and R2 MFC signalling, as well as numerous voice codecs and the SIP protocol.