... in 3.Relay encryption 4.VPN ,NAT Specifications16 Port GSM VoIP Gateway GoIP 16 with IMEI Change 1.Bulk sms ... card in 3.Relay encryption 4.VPN ,NAT16 Port GSM VoIP Gateway GoIP 16 with IMEI Change Goip 16 with ... Ready, Status, WAN, PC, GSMCall forward from GSM to VoIP and VoIP to GSMDial in mode or dial out mode onlyDial ... 2833, In-band DTMF, SIP INFO 16 Port GSM VoIP Gateway GoIP 16 with IMEI Change