4f55f5cb_ISDN_Cause_Codes__Cause_Usage
[Cause#] 43 [Fixit!] N/A [Cause Summary] Access information discarded. [Cause Usage] 
Indicates that the network could not deliver access information to the remote user as requested: i.e., user-to-user information, low layer compatibility, high layer compatibility, or a sub-address as indicated in the diagnostic.
ISDN Cause Codes
Cause Usage