Abstract: In the present technique of a call setup process, a short data burst packet is sent (106) in response to the target mobile unit being selected (104), which is followed by a call setup function being initiated (108) to establish a communication channel between a originator mobile unit and the target mobile unit as a response to the short data burst packet being sent.

Abstract: A system and method of routing messages between at least one server (104, 106, 108) and at least one remote device (114, 116, 118). A message (112) is received from a remote device (116). The remote device has an Internet Protocol (IP) address. The remote IP address is mapped to a server address corresponding to a selected one of a plurality of servers (104, 106, 108).

Abstract: A method for providing dynamic group call among a group of users both wireless (10-30) and wireline (40) places the selectability of the call in the hands of an originating user (10). An originating user (10) may make a fixed number of entries (80). The originating user (10) can create a dynamic group call, add a group call list for later execution, add a member to the group call list, or create a dynamic group call list and immediately execute a group call (92). The method for dynamic group call also provides for selecting a time to live for each group call entry (81) in database (60). This parameter time to live is directly selectable by the originating user (167) or the server. In addition, any member to a previous or existing group call may rejoin or reestablish the dynamic group call (220).

Abstract: A method for routing bearer traffic (70?) between 3G networks (32, 42) and 2G networks (12, 22) and vice versa uses voice signaling gateways (VSGW)(14, 24, 34, 44). The method determines a VSGW nearest the calling party (11). The nearest VSGW directly routes (86) the bearer traffic through the inter-network (50) to the called party (31) and avoids the “tromboning” effect of always sending bearer traffic to the called party's home location.

Abstract: For a push-to-talk function in a mobile communication system (30), an indication is received (35) by a user (50) that the talking floor is available. Next, an uplink temporary block flow is established (36). Prior to release of the uplink temporary block flow by the mobile communication system, a refresh message is sent (39) to hold the uplink temporary block flow. Downlink temporary block flows may also be refreshed by this method, or by the mobile communication system. Then the requesting user may enable the push-to-talk function. These techniques can improve talker arbitration and call setup delays for push-to-talk.