Patent ID: 8165574

Claim:
A method of establishing a mobile originated call from a mobile station operating in a Long Term Evolution, LTE, radio access network, said method comprising the steps of: establishing an interface between the mobile station and a Packet Mobile Switching Center, PMSC, over a packet switched network utilizing U8 Circuit Switched Resources, U8-CSR, protocol signaling; receiving in the PMSC, a U8-CSR service request from the mobile station; sending a Diameter AA-Request message from the PMSC to a Policy and Charging Rules Function, PCRF, requesting packet switched domain resources for the call; receiving in the PMSC, an AA-Answer message from the PCRF including terminating user plane addresses for a User Datagram Protocol, UDP, port and a network endpoint to be utilized for an uplink user plane Real Time Protocol, RTP, stream from the mobile station; establishing by the PMSC, a voice bearer channel between the mobile station and the network endpoint for transporting uplink and downlink user plane RTP streams; and facilitating by the PMSC, bidirectional voice traffic between the mobile station and the network endpoint.