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Correlating communication sessions

  • US 9,967,132 B2
  • Filed: 04/07/2009
  • Issued: 05/08/2018
  • Est. Priority Date: 04/08/2008
  • Status: Active Grant
First Claim
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1. A subscription entity in a communication system, said subscription entity comprising:

  • one or more processors, andone or more memories including computer program code, the one or more memories and the computer program code configured, with the one or more processors, to cause the subscription entity to perform the following;

    maintaining subscription data of a user, the subscription data comprising at least one Circuit Switched identity of the user and at least one IP Multimedia Subsystem (IMS) identity of the user,assigning one of the identities in the subscription data as a correlation identity for the user for correlating a Circuit Switched call of the user to a session initiation protocol (SIP) session of the user, andsending an indication of the correlation identity to a session handling entity,wherein said subscription entity provides said correlation identity to a session handling entity for use by said session handling entity in order to perform a domain transfer of the user from a circuit switched domain to an IMS domain, andwherein the correlation identity comprises a mobile subscriber international ISDN number (MSISDN) of the user and wherein the correlation identity is bound to a private IMS identity of the user.

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