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Communication system for providing roaming between an internet protocol multimedia system and a circuit-switched domain

  • US 6,871,070 B2
  • Filed: 07/31/2001
  • Issued: 03/22/2005
  • Est. Priority Date: 07/31/2001
  • Status: Expired due to Term
First Claim
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1. A method for registering a mobile unit with a communication system including a serving system and a home system, the serving system comprising an interworking MSC (iMSC) and an Internet Protocol Multimedia Subsystem (IMS), the home system comprising a Gateway MSC (GMSC) and a Home Subscriber Server (HSS), the method comprising:

  • performing a location update procedure by the mobile unit;

    processing by the serving system the registration by authenticating the mobile unit and informing the HSS of the location of the current serving system;

    determining that the serving system must process the mobile unit as an iMSC; and

    emulating the services of the iMSC by the IMS.

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