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Appendix D ISDN Information
© Polycom, Inc. 205 ViewStation User 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
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
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
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.