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System and method for providing early ringback by a home legacy mobile station domain network

  • US 20070153766A1
  • Filed: 04/15/2005
  • Published: 07/05/2007
  • Est. Priority Date: 04/16/2004
  • Status: Abandoned Application
First Claim
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1. A method of providing call progress to a calling party, comprising:

  • receiving a circuit-switched call origination message in a home legacy mobile station domain, wherein circuit-switched the call origination message specifies a destination terminal device having a directory number assigned with the home legacy mobile station domain;

    identifying a serving legacy mobile station domain in which the terminal device is registered;

    transmitting, from the home legacy mobile station domain to the serving legacy mobile station domain, a call origination message that requests the terminal device to a call with the calling party;

    receiving, by the home legacy mobile station domain from the serving legacy mobile station domain, a first message that requests the home legacy mobile station domain to provide a call progress signal to the calling party; and

    providing, by the home legacy mobile station domain, a first call progress signal to the calling party.

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