IN-SESSION COMMUNICATION

The invention relates to a method, by an initiating entity (100, 200, 210), to initiate the set up of one or more communication channels for exchange of information between the initiating entity and one or more responding entities (100, 200, 210). The method comprises the following steps: A first message is transmitted on an end-to-end control channel between a first entity (100) and a second entity. The first message comprises as a destination address a second entity address, wherein offer data is added to the transmitted first message. The offer data indicates that the initiating entity (100, 200, 210) is configured to support one or more communication channels and the offer data comprise an address at which the initiating entity is configured to receive the information. Then, a second message is received on the end-to-end control channel, the second message comprising as destination address an address of the first entity. The second message further comprises acceptance data in response to the offer data and the acceptance data indicates that a responding entity has accepted the set up of a communication channel and the acceptance data comprises an address at which the responding entity is configured to receive the information. Further, the address is stored at which the responding entity is configured to receive the information.