... 4 SIM card in, function like FXO+GSM FWT. VOIP+GSM gateway. IMEI change,VPN PPTP,Encryption.Quad band,GOIP ... gateway & 4 SIM cards Connection: Fix the 4 SIM card into the GOIP4, make the 4 GOIP-GSM connect INTERNET ... Application Condition: Standard SIP/H323 platform, GOIP4, 4 SIM cards 1. Call forward:Description: Someone is ... to dial the SIM card number of GOIP, GOIP will send the dialing number to the ...