Setting mode of communication

Abstract

A method in a communication system is disclosed. In the method a procedure for setting up a communication link between a first user equipment and a second user equipment via a communications network is initiated. Information regarding at least two modes of communication that can be used for communication via the communication link is signalled between the first and second user equipment. An indicator regarding a mode to be used for the communication is also signalled between the first user equipment and the second user equipment. After the signalling steps, a procedure for setting the mode of communication in accordance with the indicator is initiated in at least in one of the user equipment. According to an alternative embodiment signalling for reserving a possibility for at least tow different communication modes occurs between elements of the communication system.

1 . A method, comprising:
 setting up a communication link between a first user equipment and a second user equipment via a communications network, the communication link comprising a first communication leg between the first user equipment and the communication network and a second communication leg between the second user equipment and the communication network, the first user equipment being served by CS (Circuit Switched) network and the second user equipment being served by PS (Packet Switched);   signalling an indicator between an interworking network element and the first user equipment in communication via a CS environment while the second user equipment is connected to a packet switched communication environment; and   initiating in the first user equipment a procedure for provision of control operations in accordance with said indicator,   wherein the first communication leg and the second communication leg are synchronized in response to a signaled indicator regarding a mode being for use in the beginning of the communication via the communication link,   wherein the control operations comprise changing a mode used for communication via the communication link during the communication,   wherein the first user equipment and the second user equipment communicate via a corresponding one of the first communication leg and the second communication leg each comprising a wireless interface, and   wherein the second communication leg is formed between the interworking network element and the second user equipment.