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System and method for routing an incoming call to a proper domain in a network environment including IMS

  • US 8,521,170 B2
  • Filed: 01/09/2007
  • Issued: 08/27/2013
  • Est. Priority Date: 01/10/2006
  • Status: Expired due to Fees
First Claim
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1. A method, practiced by a Network Domain Selection (NeDS) network entity in an Internet Protocol (IP) multimedia subsystem (IMS), of routing an incoming call, comprising:

  • receiving a message from a Home Subscriber Server (HSS), the message being a notification message generated to inform the NeDS network entity, wherein the message indicates that a User Equipment (UE) has attached to a network;

    starting a timer upon receipt of the message, the timer having a pre-determined expiry period, wherein the NeDS network entity determines that the UE supports a given IMS service if a third party registration message is received before the timer reaches its predetermined expiry period; and

    on receiving the incoming call, consulting a database to determine a terminating network, wherein the terminating network supports the given IMS service if the NeDS network entity has determined that the UE supports the given IMS service.

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