... , Status, WAN, PC, GSM Call forward from GSM to VoIP and VoIP to GSM Dial in mode or dial out mode onlyDial PlanPassword protection for ... via GSM network. So it makes VOIP to PSTN come true.3. Other Application Condition: Standard SIP/H323 platform, GOIP4, 4 SIM cards ... a lot of international call fee.2, Call backDescription: User A uses the normal telephone or mobile phone, but he want to make ...