... change 8 gsm voip gateway (GOIP_8) gateway for call termination Specification:1. 4 GSM channels,up to ... for Power, Ready, Status, WAN, PC, GSM --Call forward from GSM to VoIP and VoIP to GSM ... --draft-ietf-sipping-cc-transfer-04 Session Initiation Protocol Call Control - Transfer --Codec: G.711 (A/µ law ... is more,it is free roaming for international call.you just pay the local callmodel1: model2:model3 ...