Patent ID: 7904057

Claim:
A communication system, comprising: a first network; a plurality of base transceiver stations (BTS) coupled to said first network; a dispatch call controller coupled to said first network; a message application server coupled to said first network, wherein said message application server is adapted to: receive a first dispatch communication including an audio message from an originating subscriber unit by way of a first dispatch communication session set up by said dispatch call controller; post said audio message for retrieval by one or more target subscriber units; send a notification of said posting of said audio message to said one or more target subscriber units; receive a request for said audio message from said one or more target subscriber units; send a dispatch call request to the dispatch call controller to establish a second dispatch communication session with said one or more target subscriber units; and send a second dispatch communication including said audio message to said requesting one or more target subscriber units by way of the second dispatch communication session set up by said dispatch call controller.