Radio over IP GSM Gateway has been designed as a gateway between the Conventional Analog orDigital Two Way Radios with the IP Protocol and the GSM 2G/3G Network. It is an advancedversion of ROIP with added feature of GSM Connectivity. It provides interconnectivity of WirelessRadio over GSM Network/ IP Network with auto switch over mechanism. It is very useful in case of emergency communication over the GSM Network in case of IP Failure or remote . It can also be used as a GSM Mobile Call Patch with the Wireless Radio Network.