Polycom RealPresence 1500 Administrator's Manual page 959

Disconnection Cause
Number Summary
102 Recovery on Timer Expired
103 Parameter Non-Existent or
Not Implemented – Passed
On (national use)
110 Message with
Unrecognized Parameter
Discarded
111 Protocol Error, Unspecified
127 Interworking, Unspecified
Polycom®, Inc.
Description
An error handling procedure timer has expired.
A message was received containing parameters that are not defined or
of a type that is defined but not implemented.
A message was discarded because it contained a parameter that was
not recognized.
A protocol error has occurred. No other disconnection cause applies.
An interworking call has ended.
Appendix A - Disconnection Causes
929