Wireless communication networks support communications between mobile communication devices. Such mobile communication devices are often referred to as subscriber units (SUs) and, in some cases, portable subscriber units (PSUs) or mobile subscriber units (MSUs). In some wireless communication networks, for example, land mobile radio (LMR) and trunked radio networks, the subscriber units can communicate with each other in talk groups. A talk group is a group of subscriber units, created by an administrator, in which each subscriber unit in the talk group may participate in a group call. Group calls may be initiated and managed, for example, at a call controller, a call center, a control head, or a server.
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The apparatus and method components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.