Localization of call routing for TDM sets in an IP network
First Claim
1. A method of routing a call request from a time-division multiplexed (TDM) set, the TDM set being connected to an IP network through an IP media gateway, the IP network including a central call server for controlling the IP media gateway and routing calls in the IP network, the IP network including a plurality of edge gateways connecting the IP network to a public switched telephone network (PSTN), the method comprising the steps of:
- receiving a signalling message at the central call server from the IP media gateway, said signalling message identifying a call from the TDM set;
identifying a geographic zone associated with the IP media gateway;
selecting one of the edge gateways based upon said geographic zone; and
sending the IP media gateway routing information for routing said call to said selected edge gateway.
24 Assignments
0 Petitions
Accused Products
Abstract
A system and method for routing calls from a time-division multiplexed (TDM) sets in an IP network to a geographically appropriate portion of the public switched telephone network (PSTN). A call is routed to an edge gateway in a geographic location corresponding to the geographic location of an IP media gateway to which the TDM set is connected. Each IP media gateway is associated with a geographic zone. Each geographic zone is also associated with at least one edge gateway. Accordingly, incoming calls are routed by the central call server based upon the geographic zone associated with the IP media gateway receiving the call, and are routed to an edge gateway associated with the identified geographic zone. The system and method may be applied to route emergency service access calls to an appropriate portion of the PSTN so that they arrive at a geographically appropriate public service answering point (PSAP).
174 Citations
26 Claims
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1. A method of routing a call request from a time-division multiplexed (TDM) set, the TDM set being connected to an IP network through an IP media gateway, the IP network including a central call server for controlling the IP media gateway and routing calls in the IP network, the IP network including a plurality of edge gateways connecting the IP network to a public switched telephone network (PSTN), the method comprising the steps of:
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receiving a signalling message at the central call server from the IP media gateway, said signalling message identifying a call from the TDM set; identifying a geographic zone associated with the IP media gateway; selecting one of the edge gateways based upon said geographic zone; and sending the IP media gateway routing information for routing said call to said selected edge gateway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for routing a call request from a time-division multiplexed (TDM) set through an IP network, the IP network including a plurality of edge gateways connecting the IP network to a public switched telephone network (PSTN), the system comprising:
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an IP media gateway connected to the TDM set and providing an interface to the IP network; and a central call server for controlling said IP media gateway and routing calls in the IP network, said central call server including an input for receiving a signalling message from said IP media gateway, said signalling message identifying a call from the TDM set, and said central call server including a component for identifying a geographic zone associated with said IP media gateway, a component for selecting one of the edge gateways based upon said geographic zone, and a component for sending routing information to the IP media gateway for routing said call to said selected edge gateway. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A central call server for routing a call request from a time-division multiplexed (TDM) set through an IP network, the IP network including a plurality of edge gateways connecting the IP network to a public switched telephone network (PSTN), the IP network including an IP media gateway connected to the TDM set and providing an interface to the IP network, the central call server comprising:
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an input for receiving a signalling message from said IP media gateway, said signalling message identifying a call from the TDM set; a component for identifying a geographic zone associated with said IP media gateway; a component for selecting one of the edge gateways based upon said geographic zone; and a component for sending routing information to the IP media gateway for routing said call to said selected edge gateway. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification