| 摘要 |
<p>A network (100) of trunked communication systems (A, B and C) supports communication with communication unit (112) roaming about the geographic area covered by said network by having control computers (106) associated with the individual trunking systems communicate directly with each other, transferring information about the roaming communication unit between themselves. The identification and privileges of the roaming communication unit (112) are passed about the network (100) by the computers (106) giving the roaming communication unit the ability to exchange data across the network directly, or, through telephone interconnects in the various trunking systems, to communicate via a voice message through the public switch telephone network (108A, 108B, 108C).</p> |
