When a call is waiting for a user, the user hears:
One quick burst of tone when a call from another user is waiting
Two quick bursts of tone when an outside call, or a call that is handled by an attendant, is waiting
Three quick bursts of tone when a priority call is waiting
Note that the system does not support special ring tones over direct inward dialing (DID) facilities.
A priority call can wait for the telephone to become idle even if Call Waiting Termination is deactivated. However, if an attendant handles the call, the user hears a busy tone, unless the Attendant Call Waiting Indication field on the Station screen is set to y.
You assign Call Waiting Termination on a per-telephone basis. For a virtual extension, you assign Call Waiting Termination on the physical telephone.