Polycom 1500/1800/2000/4000 manual Isdn Disconnection Causes Number Summary Description

			Appendix A - Disconnection Causes
	ISDN Disconnection Causes
	Number	Summary	Description
70		Only Restricted Digital	Unrestricted (64kb) bearer service has been requested but is not
		Information Bearer	supported by the equipment sending this cause.
		Capability is Available
		(national use)
79		Service or Option Not	An unsupported service or unimplemented option has been requested.
		Implemented, Unspecified	No other disconnection cause applies.
81		Invalid Call Reference	A message has been received which contains a call reference which is
		Value	currently unassigned or not in use on the user-network interface.
82		Identified Channel Does	A request has been received to use a channel which is currently
		Not Exist	inactive or does not exist.
83		A Suspended Call Exists,	A RESUME message cannot be executed by the network as a result of
		but This Call Identity Does	an unknown call identity.
		Not Exist
84		Call Identity in Use	A SUSPEND message has been received with a call identity sequence
			that is already in use.
85		No Call Suspended	A RESUME message cannot be executed by the network as a result of
			no call suspended.
86		Call Having the Requested	A RESUME message cannot be executed by the network as a result of
		Call Identity Has Been	the call having been cleared while suspended.
		Cleared
87		User Not Member of CUG	A CUG member was called by a user who is not a member of the CUG
			or a CUG call was made to a non CUG member.
88		Incompatible Destination	User-to-user compatibility checking procedures in a point-to-point data
			link have determined that an incompatibility exists between Bearer
			capabilities.
90		Non-Existent CUG	CUG does not exist.
91		Invalid Transit Network	The transit network selection is of an incorrect format. No route (transit
		Selection (national use)	network) exists between the two networks.
95		Invalid Message,	Invalid message received. No other disconnection cause applies.
		Unspecified
96		Mandatory Information	A message was received with an information element missing.
		Element is Missing
97		Message Type	A message was received that is of a type that is not defined or of a type
		Non-Existent or Not	that is defined but not implemented.
		Implemented

98Message is Not Compatible with the Call State, or the Message Type is Non-Existent or Not Implemented

An unexpected message or unrecognized message incompatible with the call state has been received

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