Polycom DOC2091A manual Isdn Cause Codes, Cause Cause Description Definition Code

Appendix

ISDN Cause Codes

Cause	Cause Description	Definition
Code
1	Unassigned number	The switch received the sent ISDN number in the correct
		format; however, no destination equipment uses the number.
2	No route to specified transit	The ISDN exchange cannot recognize the intermediate
	network	network through which to route the call.
3	No route to destination	The intermediate network through which the call is routed does
		not service the destination address.
6	Channel unacceptable	The specified channel does not provide sufficient service
		quality to accept the requested connection.
7	Call awarded and delivered	The user is assigned an incoming call that is being connected
		to an already-established call channel.
16	Normal call clearing	Normal call clearing has occurred.
17	User busy	All B channels are in use; the called system acknowledges the
		connection request, but is unable to accept the call.
18	No user responding	The destination does not respond to the call so the connection
		cannot be completed.
19	No answer from user (user	The destination fails to complete the connection within the
	alerted)	prescribed time after responding to the connection request.
		The problem occurs at the remote end of the connection.
21	Call rejected	The destination rejects the call for an unknown reason,
		although capable of accepting the call.
22	Number changed	No system has been assigned the ISDN number used to set
		up the call. (The diagnostic field of the message may return an
		alternate address is assigned to the called equipment.)
25	Non-selected user clearing	The destination rejected the call, although capable of accepting
		it, because the call was not assigned to the user.
27	Destination out of order	A signaling message cannot be delivered because the interface
		is not functioning correctly, and therefore the destination can
		not be reached. This condition might be temporary, though of
		extended duration; for instance, remote equipment might be
		turned off.
28	Invalid number format	Destination address presented in an unrecognizable format or
		an incomplete destination address made the connection unable
		to be established.

Global Management System User’s Guide Appendix 149