... 4FXO,8FXS/8FXO,16FXS/16FXO,32FXS multiple interfacesStandard SIP V2.0, MGCP V1.0(option) protocolsStandard G.711A/U,G.723.1,G ... ,1WANDAG1000(4FXS/FXO) :3LAN,1WANDAG2000(24/32FXS):4LANMGCP(option)MGCP V1.0, RFC2705SIPRFC3261 - Session Initiation ProtocolVoice over packet Capabilities VAD, CNG, ... ,8FXS/8FXO,16FXS/16FXO multiple interfaces Standard SIP V2.0, MGCP V1.0 protocols Standard G.711A/U,G.723.1,G ...