The invention relates to a session control entity, method and a computer program product for 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 the second encoding and removing the first codec list from the request for the session. Further, removing a second codec list in the 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, a third codec list in the first encoding, and transmitting the request for the session.