4f55f5cb_ISDN_Cause_Codes__Cause_Usage
[Cause#] 79 [Fixit!] N/A [Cause Summary] Service or option not implemented, unspecified. [Cause Usage] 
Used to report a service or option not implemented event only only when no other cause in the service or option not implemented class applies.
ISDN Cause Codes
Cause Usage