Method and system for deactivating a service account

The present invention relates to a method and system for deactivating a service account associated with an application server (60) of a registered subscriber within a signaling network supporting IP based services. A status of the service account is monitored, and a request for de-registration or barring is forwarded to a registration server (20), which maintains a registration status of said subscriber, over an interface directly coupling the application server and the registration server upon determining that disruption or termination of service is required. The registration status of said subscriber is then changed so as to de-register or, respectively, bar the subscriber at the registration server by changing the registration status in response to said de-registration or barring request. Thereby, the application server is able to actively initiate a de-registration of a subscriber or a specific user identity without requiring any new registration package.