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System, apparatus, and method for establishing circuit-switched communications via packet-switched network signaling

  • US 8,102,839 B2
  • Filed: 02/21/2008
  • Issued: 01/24/2012
  • Est. Priority Date: 10/17/2003
  • Status: Active Grant
First Claim
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1. A method comprising:

  • forming a session initiation protocol (SIP) INVITE at a first user equipment (UE-A) to establish a SIP dialog associated with originating a call in the CIS domain with a second user equipment (UE-B), the SIP INVITE message including a session description protocol (PSTN) payload comprising;

    a) a connection data field indicating public switched telephony network (PSTN) connection parameters;

    b) a media type indicating an audio stream; and

    c) an indication that the circuit-switched (CS) domain will be used for delay-sensitive class flow;

    sending the SIP INVITE message via an Internet Protocol Multimedia Subsystem (IMS);

    receiving a SIP response comprising a CS bearer media descriptor that includes a phone number associated with the UE-B; and

    sending, in response to receiving the SIP response, a circuit-switched call setup message to establish the call via the circuit switched domain, wherein the call setup message comprises the phone number associated with the UE-B.

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