Polycom MP, 128, 512 manual Isdn Switches, Isdn Errors

ISDN Information

ISDN Switches

Depending on the type of ISDN lines you are using, your service provider may assign zero, one, or two SPIDs per line.

Switch Type	SPIDs Allocated
AT&T 5ESS Custom	None
AT&T 5ESS NI-1	1 per B-channel
NT DMS-100 NI-1	1 per B-channel
NI-2	1 per device
Siemens EWSD NI-1	1 per B-channel
Siemens EWSD NI-2	1 per device
International (outside United States or	None
Canada)

ISDN Errors

The following table describes ISDN standard cause values that are sent from the ISDN switch to the router to indicate ISDN call status. Although the cause values are standardized, each ISDN service provider phrases the cause differently. Therefore, the causes shown in the table might not be the exact messages that appear on your television monitor.

		ISDN Errors
Code	Cause	Definition
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	The ISDN exchange can not recognize the intermediate network
	transit network	through which to route the call.
3	No route to destination	The destination address is not serviced by the intermediate network
		through which the call is routed.
6	Channel unacceptable	The specified channel does not provide sufficient service quality to
		accept the requested connection.
7	Call awarded and	The user is assigned an incoming call that is being connected to an
	delivered	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.

ViewStation User’s Guide 131