Polycom MP, 128, 512 manual The receiving equipment received a message that did not include

ISDN Information

		ISDN Errors (Continued)
Code	Cause	Definition
	Invalid message,	An invalid message was received, and no standard cause applies.
95		This is usually due to a D-channel error. If this error occurs
	unspecified
		systematically, report it to your ISDN service provider.
	Mandatory information	The receiving equipment received a message that did not include
96		one of the mandatory information elements. This is usually due to a
	element is missing	D-channel error. If this error occurs systematically, report it to your
		ISDN service provider.
		The receiving equipment received an unrecognized message,
97	Message type nonexistent	either because the message type was invalid or because the
		message type was valid but not supported. Cause 97 is due to
	or not implemented
		either a problem with the remote configuration or a problem with
		the local D channel.
	Message incompatible	The remote equipment received an invalid message, and no
		standard cause applies. Cause 98 is usually due to a D-channel
98	with call state or message
		error. If this error occurs systematically, report it to your ISDN
	type nonexistent
		service provider.
	Information element	The remote equipment received a message that includes
		information elements which were not recognized. This is usually
99	nonexistent or not
		due to a D-channel error. If this error occurs systematically, report it
	implemented
		to your ISDN service provider.
	Invalid information	The remote equipment received a message that includes invalid
100		information in the information element. This is usually due to a D-
	element contents
		channel error.
	Message not compatible	The remote equipment received an unexpected message that does
101		not correspond to the current state of the connection. This is usually
	with call state
		due to a D-channel error.
102	Recovery on timer expiry	A timer expiry initiated an error-handling (recovery) procedure.
		This problem is typically temporary.
111	Protocol error, unspecified	An unspecified D-channel error when no other standard cause
		applies.
127	Interworking, unspecified	An event occurred, but the network does not provide causes for the
		action that it takes. The precise problem is unknown.
145	ISDN layer 1 and/or 2	User needs to check cabling, ISDN adapter status and network
	link not established	connections.
146	ISDN layer 3 connection	A switch protocol error exists, or (in the United States or Canada) a
	to the ISDN switch/	SPID assignment problem. There is either a switch protocol error,
	network inactive	or (in the United States or Canada) a SPID assignment problem.
255	ISDN command	The ISDN signaling code has encountered an error processing an
	processing error	ISDN action. ISDN adapter busy-wait and retry.

134 ViewStation User’s Guide