... ProcessorBasic FeaturesLEDs for Power, Ready, Status, WAN, PC, GSM Call forward from GSM to VoIP and VoIP to GSM Dial in mode ... : Standard SIP/H323 platform, GOIP4, 4 SIM cards 1. Call forward:Description: Someone is in China, but all most of his ... the B number they want to dial, then the call from A to B is connected. VOIP GSM gateway with 4 ...