System and method for providing group voice services in a wireless network

A arranged to provide voice services group in a wireless network system comprising: a plurality of wireless networks (100) arranged to handle calls between mobile units (120), in which calls are initiated by call setup and notice in-band signaling within the wireless networks (100) and voice frames for the calls are switched between the mobile units (120) across bearer paths (110) in the wireless networks (100); and real-time exchange (102) arranged to interface with a first wireless network (100) designated as a group home network (304), to provide the same voice calls group, both exchange real-time (102) as the mobile units (120) involved in voice calls, are willing to communicate with each other using the call setup and in-band signaling within the group home network (304), and the real-time exchange (102) is arranged to switch the voice frames for voice calls group from an originating mobile unit (120) to all mobile units (120) termination, through the bearer paths (110 ) in wireless networks (100); It characterized in that the system further comprises: a gateway link roaming (302) located within the ready home network (304) to interface with real-time exchange (102) and at least one mobile switching center (104) inside a second wireless networks (100) designated as a foreign network (306) to provide voice calls group for mobile units (120) roaming in the foreign network (306), wherein the roaming mobile unit ( 120) is arranged to cause voice calls group by providing a number for the gateway link roaming (302) to the mobile switching center (104), the mobile switching center (104) is arranged to establish calls group voice with the gateway link roaming (302) using the numbers provided by the mobile unit (120) roaming, and gateway link roaming (302) is arranged to establish a voice path with the mobile unit (120) roaming in order to switch the voice frames for voice calls to the group from the mobile unit (120) roaming to all mobile terminating units (120) across bearer paths (110) in wireless networks (100).