IN-SESSION COMMUNICATION FOR SERVICE APPLICATION

The invention relates to a method carried out by a service control entity to set up a communication path for exchange of service control messages with a service application entity (200) in a mobile communications network for controlling an application of a service, by the service application entity (200), to a media data flow, the media data flow being established between the service control entity (100, 300) and a remote end. A first message is transmitted on a service control channel, the first message comprising as a destination address an address of the remote end, wherein offer data is added to the transmitted first message, the offer data including an indicator indicating that the service control entity is configured to support a communication path on a media data plane of the media data flow based on Real Time Transport Control Protocol, RTCP, service control messages. A second message is received on the service control channel, wherein the second message comprises acceptance data in response to the offer data, the acceptance data comprising a receiver address at which the service application entity (200) is configured to receive RTCP service control messages. The receiver address is stored at which the service application entity (200) is configured to receive RTCP service control messages in order to set up the communication path between the service control entity and the service application entity.