1,RoIP Gateway,VoIP phone,sip voip 2,Build in GSM/CDMA Module 3,Point-to-Point ... 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 Public Announce (PA) networks.It ...