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ISDN Information
131
ViewStation User’s Guide
ISDN Switches
Depending on the type of ISDN lines you are using, your service provider may
assign zero, one, or two SPIDs per line.
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.
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
Canada)
None
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
transit network
The ISDN exchange can not recognize the intermediate 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
delivered
T h e u s er i s a s s ig n ed an i nc o mi n g ca l l t h at i s be in g co n n ec t ed t o a n
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.