With the CAC feature you can prevent voice traffic congestion and ensure that there is enough bandwidth for authorized media sessions by limiting the calls on a connection or link. The BSG applies CAC during call setup to limit the initiation of dialogs and transactions. Dialogs are call attempts or INVITE messages. Transactions are out-of-dialog request messages including REGISTER, OPTIONS, MESSAGE, and INVITE (INVITE messages that open a dialog).
To use CAC, you configure CAC criteria and then apply the criteria using new transaction policy actions. The policy action verifies whether a new event is permitted or not. If it is not permitted, the BSG rejects the dialog or out-of-dialog transaction by sending 403 FORBIDDEN message.
Table 16 lists the configurable CAC criteria and their maximum values. These maximum values are used by default.
Table 16: CAC Parameters
