... 4 E1/T1 digital trunks 2.Digital Media Gateway 3. SIP, ISDN PRI, G.711, G.729A MX100- ... TG Trunking voip Gateway With up to 4 E1/T1 ... Gateway supports varieties of protocols and codecs, including SIP, ISDN PRI, G.711, G.729A, G.723, iLBC, GSM, ... a 1U chassis.Applications- PSTN-SIP digital trunking gateway- Interconnecting legacy PBX to IP-based voice networkModelE1 ...