Polycom 1500/1800/2000/4000 manual Mandatory information elements containing invalid content

Appendix A - Disconnection Causes

ISDN Disconnection Causes

Number Summary Description

99An Information Element or Parameter Does Not Exist or is Not Implemented

A message was received containing elements or parameters that are not defined or of a type that is defined but not implemented.

100	Invalid Information Element	A message other than SETUP, DISCONNECT, RELEASE, or
	Contents	RELEASE COMPLETE has been received which has one or more
		mandatory information elements containing invalid content.

101The Message is Not Compatible with the Call State

A STATUS message indicating any call state except the Null state has been received while in the Null state.

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

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