Patent ID: 8989179
Filing Date: 2015-03-24
Classification: H04L,H04M,H04W

Abstract:
1. A method for an application server (AS) node, the method comprising: receiving a first SIP Invite request from a mobile communication device, the first SIP Invite request having call information which includes a call reference number, a uniform resource indicator (URI) of a called party and data used for determining whether the first SIP Invite request is for a bearer over a circuit-switched (CS) network; associating an E.164 number with the call information in the first SIP Invite request; sending a SIP response to the mobile communication device in response to receiving the first SIP Invite request, the SIP response including the E.164 number and the call reference number; after sending the SIP response, receiving a call setup message from the CS network, the call setup message having the E.164 number; verifying that the received E.164 number remains valid; identifying the call information based on the E.164 number; and sending, to the called party, a second SIP Invite request that includes the call information.