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System and method for facilitating roaming of push to talk subscribers across disparate dispatch networks

  • US 7,702,346 B2
  • Filed: 09/09/2005
  • Issued: 04/20/2010
  • Est. Priority Date: 09/09/2004
  • Status: Expired due to Fees
First Claim
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1. An inter-working network for facilitating dispatch communications between a plurality of dispatch networks, at least two of the dispatch networks having incompatible technologies, the inter-working network comprising:

  • an integrated dispatch enhanced network that is a first of the at least two dispatch networks;

    a high performance push-to-talk network that is a second of the at least two dispatch networks, wherein the inter-working network is adapted to facilitate dispatch communications between roaming subscribers on the integrated dispatch enhanced network and roaming subscribers on the high performance push-to-talk network;

    a core inter-working network;

    a plurality of points-of-presence connected to the core inter-working network; and

    a plurality of border gateways interfacing each of the dispatch networks to at least one of the plurality of points-of-presence;

    wherein the points-of-presence facilitate roaming of subscribers on the dispatch networks by translating dispatch session messages received from an originating dispatch network into a common signaling format before session processing, and translating dispatch session messages from the common signaling format into a format compatible with a target dispatch network.

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