When codec restrictions are in place, they are applicable to all calls on the bandwidth-limited link. However, the administrator can override, on a per-endpoint and/or per-subscriber basis, the codec restrictions the CAC policy imposes.
After doing so, the entity (endpoint or subscriber) can perform normal codec negotiation, using all codecs offered by the endpoints.
The following are examples of scenarios in which this ability is useful:
Calls to and from unknown destinations that exit and enter the VoIP network via a particular endpoint (gateway)Parent topic: CAC (Call Admission Control)
Calls to the media server that provides large conferencing support
Calls to and from an executive