... and the IP networks by enabling voice communications. It is installed on the Mobile SIM Card, you can ... have 1, 4, 8, 16 ports GSM VoIP Gateway. there are 7 models.GoIP-1 ( supporting one SIM card ), ... of our technology support engineers. FAQ 1.What is main funtion of the 16 ports terminal gsm voip ... channel,G729 need 34kbps,G711 need 90 kbps 5. Is there any 32 ports or 64 ports GSM VOIP GATEWAY?Each ...