Method and system for controlling call admission in IMS

摘要

A method and a system for controlling call admission for parallel ringing processes to a realm in an IMS (3) is disclosed. The method comprises receiving a call control message to a called party (21), determining whether the called party has parallel ringing enabled, if positive, generating a plurality of parallel call control messages, associating to each parallel call control message a parallel ringing identifier indicating that the corresponding call control message is a parallel call control message, receiving a plurality of call control messages directed towards the realm, performing call admission control for this realm by verifying whether a parallel ringing identifier is associated to each call control message directed towards this realm so as to determine if the call control message is a parallel call control message.