NGN - Isdn Pri VoIP SIP Trunk Gateway with 4 E1/T1 Port (MTG200-4E1/T1)
China NGN -Isdn Pri VoIP SIP Trunk Gateway with 4 E1/T1 Port (MTG200-4E1/T1), Find details about China T1 Protocol, E1 Voip Trunk Media Gateway from NGN -Isdn Pri VoIP SIP Trunk Gateway with 4 E1/T1 Port (MTG200-4E1/T1)