| 摘要 |
A method and a system for controlling call admission for parallel ringing processes to a realm in an IMS is disclosed. The method comprises receiving a call control message to a called party, 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.
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