... and VOIP network seamless connect ed product. Fix 4 SIM card into the GOIP4 gateway, it can connect the GSM ... switch, make a call to anyone of the 4 SIM card’s number, you will hear the dial tone again ... gateway, all the phone to this 4 Malaysia’s SIM card will be transfer to his Chinese phone, this can ... VOIP, so user A just need to dial the SIM card number of GOIP, GOIP will send the dialing number ...