Control of codec negotiation for communication connection

A session control entity, comprising:

• at least one processor;
• and
• at least one memory including computer program code;
• the at least one memory and the computer program code are configured to, with the at least one processor, cause the session control entity at least to:
• receive a request for a session,
• decide on removal of a user plane gateway from a user plane of the session,
• extract, when the user plane gateway is to be removed, a first codec list in a second encoding and removing the first codec list from the request for the session,
• remove a second codec list in a first encoding from the request for the session,
• derive a third codec list, when the user plane gateway is to be removed, from the first codec list, or, when the user plane gateway is not to be removed, from the second codec list,
• include in the request for the session, a third codec list in the first encoding, and
• transmit the request for the session.

A method for controlling routing of user plane traffic, comprising

• receiving a request for a session,
• deciding on removal of a user plane gateway from a user plane of the session,
• extracting, when the user plane gateway is to be removed, a first codec list in a second encoding and removing the first codec list from the request for the session,
• removing a second codec list in a first encoding from the request for the session,
• deriving a third codec list, when the user plane gateway is to be removed, from the first codec list, or, when the user plane gateway is not to be removed, from the second codec list,
• including in the request for the session, the third codec list in the first encoding, and
• transmitting the request for the session.