... digital trunks 2.Digital Media Gateway 3. SIP, ISDN PRI, G.711, G.729A SIP - PSTN Trunking voip Gateway With up to ... Digital Media Gateway supports varieties of protocols and codecs, including SIP, ISDN PRI, G.711, G.729A, G.723, iLBC, GSM ... networks. It is packaged in a 1U chassis.Applications- PSTN-SIP digital trunking gateway- Interconnecting legacy PBX to IP-based voice ...