System, method and devices providing a communication mode selection procedure

摘要

Embodiments relate to a method, system and network element, e.g. portable terminal, connectable to another network element. One of selectable modes is used for communication. A network element is adapted to perform a mode selection procedure for selecting the same mode for bidirectional communication between the network elements. The mode selection ensures the use of the same mode e.g. in uplink and downlink direction and thus enables e.g. IP telephony in UMTS using SIP protocol. Embodiments may e.g. facilitate a VoIP communication session by way of a radio link with a mobile station.