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

  • US 20030027569A1
  • Filed: 07/31/2001
  • Published: 02/06/2003
  • Est. Priority Date: 07/31/2001
  • Status: Active Grant
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 a mobile switching center (MSC) and an interworking MSC (iMSC), the iMSC including at least one Media Gateway (MGW) that is controlled by the iMSC, the home system comprising a Gateway MSC 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; and

    determining that the serving system must process the mobile unit as an MSC.

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