A content-provider entity provides content to media channels established in respect of a network communication session. The content-provider entity has a transport subsystem for establishing media channel connections to a session transport mechanism in accordance with channel type and connection details received by the entity. The content-provider entity also has a media subsystem providing a respective media handler of appropriate type for each media channel connection established by the transport subsystem. Each media handler is responsible for delivering media content of its associated type from a media source to the corresponding channel connection. A delivery controller of the media subsystem controls the selection and delivery of media content through the media handlers in dependence on context data supplied to the content-provider entity.