Implementing redirect on interoperability gateway for CDMA terminated PTT calls
First Claim
1. In a communications system including a first push-to-talk (PTT) network, and a second PTT network having a plurality of interoperability gateways, a method for selecting an interoperability gateway for PTT calls terminated at the second PTT network comprising:
- receiving a first PTT call request from the first PTT network, the first PTT call request identifying a target subscriber unit on the second PTT network;
forwarding the first PTT call request to a first interoperability gateway of the second PTT network'"'"'s plurality of interoperability gateways;
receiving a redirect message from the first interoperability gateway including an identification of the target subscriber and a second interoperability gateway of the second PTT network'"'"'s plurality of interoperability gateways, wherein the second interoperability gateway corresponds to a location of the target subscriber unit;
storing an identifier of the target subscriber and an identifier of the second interoperability gateway in a cache for subsequent use in routing calls to the target subscriber unit; and
redirecting the first PTT call to the second interoperability gateway.
1 Assignment
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Accused Products
Abstract
A communications system includes a first PTT network, and a second PTT network having a plurality of interoperability gateways. A method for routing a PTT call terminated at the second PTT network includes receiving a PTT call request from the first PTT network, the PTT call request identifying a target subscriber unit on the second PTT network and forwarding the PTT call request to a first interoperability gateway. If the target is located in a region served by a second PTT interoperability gateway, then a redirect message, including an identifier of the second PTT interoperability gateway, is received and the PTT call request is redirected to the second PTT interoperability gateway. An identifier of the target and an identifier of the second PTT interoperability gateway are stored in a cache for directing subsequent PTT calls to the same target to the corresponding second interoperability gateway. In one embodiment, the first PTT network is an iDEN network and the second PTT network is a HPPTT network and the PTT call is a HPPTT call.
25 Citations
17 Claims
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1. In a communications system including a first push-to-talk (PTT) network, and a second PTT network having a plurality of interoperability gateways, a method for selecting an interoperability gateway for PTT calls terminated at the second PTT network comprising:
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receiving a first PTT call request from the first PTT network, the first PTT call request identifying a target subscriber unit on the second PTT network; forwarding the first PTT call request to a first interoperability gateway of the second PTT network'"'"'s plurality of interoperability gateways; receiving a redirect message from the first interoperability gateway including an identification of the target subscriber and a second interoperability gateway of the second PTT network'"'"'s plurality of interoperability gateways, wherein the second interoperability gateway corresponds to a location of the target subscriber unit; storing an identifier of the target subscriber and an identifier of the second interoperability gateway in a cache for subsequent use in routing calls to the target subscriber unit; and redirecting the first PTT call to the second interoperability gateway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a PTT communications system including a first push-to-talk (PTT) network and a second PTT network having a plurality of interoperability gateways, a PTT interoperability infrastructure comprising:
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a PTT controller adapted to select one of the second PTT network'"'"'s plurality of interoperability gateways in response to a first PTT call request from the first PTT network to a PTT target on the second PTT network, and forward the first PTT call request to the selected PTT interoperability gateway, wherein the PTT controller is further adapted to receive a redirect message from the selected PTT interoperability gateway, the redirect message including an identifier of a second PTT interoperability gateway of the second PTT network'"'"'s plurality of interoperability gateways, wherein the second interoperability gateway corresponds to a location of the PTT target, store the identifier of the second PTT interoperability gateway for use in routing a second PTT call request to the PTT target, and redirect redirecting the first PTT call request to the second PTT interoperability gateway. - View Dependent Claims (10, 11)
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12. In a PTT communications system including a first PTT network which is an integrated dispatch enhanced network (iDEN) and a second PTT network which is a high performance PTT (HPPTT) network having a plurality of interoperability gateways, a system comprising:
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an interface to the iDEN network; an interface to the HPPTT network; a controller adapted to; receive a first PTT call request from the iDEN network, the first PTT call request identifying a target subscriber unit on the HPPTT network; forward the first PTT call request to a first HPPTT interoperability gateway of the HPPTT network'"'"'s plurality of interoperability gateways; receive a redirect message from the first HPPTT interoperability gateway, including an identification of the target subscriber and a second interoperability gateway of the HPPTT network'"'"'s plurality of interoperability gateways, wherein the second interoperability gateway corresponds to a location of the target subscriber unit; store the identification of the target subscriber and the second interoperability gateway for use in routing a subsequent PTT call request to the target subscriber; and redirect the first PTT call to the second interoperability gateway. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification