An interface module for a telecommunications network service entity, the interface module being operable to communicate with an application provided on the telecommunications network service entity and a session layer of the telecommunications network service entity, the interface module comprising a generic container to communicate with the application and a protocol connector operable to communicate with an API of the session layer and the generic container, wherein the protocol connector is operable to receive a message from the protocol stack API in accordance with a corresponding protocol, and pass the message to the generic container, which passes the message to the application.