Polycom 1500/1800/2000/4000 manual Isdn Disconnection Causes

			Appendix A - Disconnection Causes
	Call Disconnection Causes
	Disconnection Cause		Description
	SIP server error 505		The SIP server sent a SIP Server Error 505 (Version Not Supported)
			response.
			The server does not support, or refuses to support, the SIP protocol
			version that was used in the request.
	SIP temporarily not available		The participant's endpoint was contacted successfully but the
			participant is currently unavailable (e.g., not logged in or logged in such
			a manner as to preclude communication with the participant).
	SIP remote device did not respond in the		The endpoint did not respond in the given time frame.
	given time frame
	SIP trans error TCP Invite		A SIP Invite was sent via TCP, but the endpoint was not found.
	SIP transport error		Unable to initiate connection with the endpoint.
	SIP unauthorized		The request requires user authentication.
	SIP unsupported media type		The server is refusing to service the request because the message
			body of the request is in a format not supported by the requested
			resource for the requested method.
	ISDN Disconnection Causes
	ISDN Disconnection Causes
	Number	Summary	Description
1		Unallocated (unassigned	No route to the number exists in the ISDN network or the number was
		number)	not found in the routing table.
			• Ensure that the number appears in the routing table.
			• Ensure that it is a valid number and that correct digits were dialed.
2		No route to specified transit	The route specified (transit network) between the two networks does
		network (national use)	not exist.
3		No route to destination	No physical route to the destination number exists although the dialed
			number is in the routing plan.
			• The PRI D-Channel is malfunctioning.
			• Incorrect connection of the span or WAN.
4		Send special information	Return the special information tone to the calling party indicating that
		tone	the called user cannot be reached.
5		Misdialed trunk prefix	A trunk prefix has erroneously been included in the called user number.
		(national use)
6		Channel Unacceptable	The sending entity in the call does not accept the channel most
			recently identified.

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