Polycom 1500/1800/2000/4000 manual Enquiry

Appendix A - Disconnection Causes

ISDN Disconnection Causes

Number Summary Description

7Call awarded and being delivered in an Established channel

The incoming call is being connected to a channel previously established for similar calls.

8	Pre-Emption	The call has been pre-empted.
9	Pre-Emption – Circuit	Call is being cleared in response to user request.
	reserved for reuse
16	Normal Call Clearing	Call cleared normally because user hung up.
17	User Busy	Dialed number is busy.
18	No User Responding	The called user has not answered the call.
19	No Answer from User	Called user has received call alert, but has not responded within a
	(User Alerted)	prescribed period of time. Internal network timers may initiate this
		disconnection.
20	Subscriber Absent	User is temporarily absent from the network - as when a mobile user
		logs off.
21	Call Rejected	Called number is either busy or has compatibility issues.
		Supplementary service constraints in the network may also initiate the
		disconnection.
22	Number Changed	Same as Cause 1. The diagnostic field contains the new called user
		number. Cause 1 is used if the network does not support this cause
		value.
26	Non-Selected User	The incoming call has not been assigned to the user.
	Clearing
27	Destination Out-of-Order	Messages cannot be sent to the destination number because the span
		may not be active.
28	Invalid Number Format	The Type of Number (TON) is incorrect or the number is incomplete.
	(address incomplete)	Network, Unknown and National numbers have different formats.
29	Facility Rejected	User requested supplementary service which cannot be provided by
		the network.
30	Response to STATUS	A STATUS message has been received in response to a prior STATUS
	ENQUIRY	ENQUIRY.
31	Normal, Unspecified	A normal, unspecified disconnection has occurred.
34	No Circuit/Channel	No B-Channels are available for the call.
	Available
38	Network Out-of-Order	Network is out-of-order because due to a major malfunction.
39	Permanent Frame Mode	A permanent frame mode connection is out-of-service. This cause is
	Connection Out-of-Service	part of a STATUS message.

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