Voice compression system and 3G media gateway for carrier-grade voice trunking provides compressed voice transmission over both TDM and IP networks. It compresses up to 16 E1/T1 circuits over redundant E1/T1 or Ethernet access links, with backup between the TDM and IP connections. In addition to its TDMoIP multiplexing and powerful voice compression capabilities, the Vmux-2120 universal voice trunking gateway supplies 3G media gateway services and is interoperable with NG-MSCs and softswitches