Polycom ViewStation manual Isdn Switches, Isdn Errors, Switch Type SPIDs Allocated

Appendix D 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 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.

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

© Polycom, Inc. 205 ViewStation User Guide