1,RoIP Gateway,VoIP phone,sip voip 2,Build in GSM/CDMA Module ... Transmit Mode 4,Link up radio RoIP Gateway,VoIP phone,SIP VoIP Description:What is a Cross-Network Gateway? ... It enables voice communications among the Radio, VoIP, GSM, and ... (RoIP) which converts radio voice communications into VoIP.It links up various radio networks together in ...