A service control element stores a user filter criterion. When it receives a session request identifying the user, it checks whether the session request matches the user filter criterion, and outputs the session request to a defined service platform when the session request matches the user filter criterion. The element is arranged to retrieve, before forwarding the request to the service platform, a capability information element that indicates the dynamic capability of a user to utilize the service provided by the service platform. If the information element indicates that the user is not capable to utilize the service provided by the service platform, the session is terminated. Incoming messages can be appropriately managed already in the network element responsible for service control, and thus additional load and unnecessary charging considerations can be avoided.