4f55f5cb_ISDN_Cause_Codes__Cause_Usage
[Cause#] 63 [Fixit!] N/A [Cause Summary] Service or option ot available, unspecified. [Cause Usage] 
Used to report a service or option not available event only when no other cause in the service or option not available class applies.
ISDN Cause Codes
Cause Usage