Patent ID: 8102839
Filing Date: 2012-01-24
Classification: B01J,G01N,Y10T

Abstract:
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: 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.