Polycom RealPresence RMX 1500 Administrator's Manual page 931

ISDN Disconnection Causes
Number Summary
99 An Information Element or
Parameter Does Not Exist
or is Not Implemented
100 Invalid Information Element
Contents
101 The Message is Not
Compatible with the Call
State
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
A message was received containing elements or parameters that are
not defined or of a type that is defined but not implemented.
A message other than SETUP, DISCONNECT, RELEASE, or
RELEASE COMPLETE has been received which has one or more
mandatory information elements containing invalid content.
A STATUS message indicating any call state except the Null state has
been received while in the Null state.
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
900