An enhanced mechanism for conflict resolution between authorized services in respect of selective authorization criteria, such as service incompatibilities, subscribed bandwidth QoS assigned per subscriber and pre-emption priority value assigned per service. The present invention allows the authorization of a subsequent service as a result of applying a selective authorization criterion for the subscriber at a policy control rules server to determine those previously authorized services to be put on hold, notifying about said previously authorized services to be on hold towards application devices handling such services, and inactivating at a policy enforcement device those control rules applicable to the media associated with said previously authorized services. In addition, the method as well as the policy control rules server, the application devices and the policy enforcement device may be also arranged for re-activating said previously authorized services still on hold when the reason for being on hold has ceased.