METHODS OF AND NODES FOR LOCATING AN EMERGENCY VOICE SESSION ANCHORING NODE IN A SERVING COMMUNICATION NETWORK FOR TRANSFERRING AN EMERGENCY VOICE SESSION

摘要

A method of locating an emergency voice session anchoring node (212) of a plurality of emergency voice session anchoring nodes in an Internet Protocol Multimedia Subsystem of a serving communication network (200) for transferring an emergency voice session of a terminal from a packet switched source radio access network (260) of the serving communication network (200) to a target radio access network (278) of the serving communication network (200) associated with a circuit switched domain of the serving communication network (200) is described. The emergency voice session is anchored in the emergency voice session anchoring node (212) and the transferring of the emergency voice session employs voice session continuity. The emergency voice session anchoring node (212) is identified by a node identifier. The method is executed by the emergency voice session anchoring node (212). The method comprises (240) sending the node identifier of the emergency voice session anchoring node (212) towards a control node (206) of the circuit switched domain of the serving communication network (200) for the locating of the emergency voice session anchoring node (212). Thereby, a support of a reliable session transfer of the emergency voice session from the packet switched source radio access network (260) to the target radio access network (278) associated with the circuit switched domain of the serving communication network (200) may be enabled.