The type of call treatment to apply on a new call when
a call resource threshold is exceeded. This treatment
is applicable if the threshold action (ccacSysRpAction)
includes 'treatment(3)' or 'busyoutAndTreatment(4)'.
hairpin(1) - Connect the call back to the PSTN via
another telephony port.
reject(2) - Reject the call, using cause code specified
in ccacSysRejectCode
playMessage(3) - Reject the call and send the specified
audio message. The audio file used for
'playMessage(3)' is specified in
ccacSysPlayMessageFile.
The 'playMessage(3)' option only applies to Voice over ATM,
IP, or FrameRelay calls. For other types of calls,
a value of 'playMessage(3)' is equivalent to 'reject(2)'.