Isdn Switches; Isdn Errors - Polycom ViewStation EX User Manual

Appendix D

ISDN Switches

ISDN Errors

© Polycom, Inc.
Depending on the type of ISDN lines you are using, your service
provider may assign zero, one, or two SPIDs per line.
Switch Type
AT&T 5ESS Custom
AT&T 5ESS NI-1
NT DMS-100 NI-1
NI-2
Siemens EWSD NI-1
Siemens EWSD NI-2
International (outside United States or
Canada)
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
1 Unassigned number
2 No route to
specified transit
network
3 No route to
destination
6 Channel
unacceptable
7 Call awarded and
delivered
16 Normal call clearing
17 User busy
The switch received the sent ISDN number
in the correct format; however, no
destination equipment uses the number.
The ISDN exchange can not recognize the
intermediate network through which to
route the call.
The destination address is not serviced by
the intermediate network through which
the call is routed.
The specified channel does not provide
sufficient service quality to accept the
requested connection.
The user is assigned an incoming call that
is being connected to an
already-established call channel.
Normal call clearing has occurred.
All B channels are in use; the called system
acknowledges the connection request, but
is unable to accept the call.
205
ISDN Information
SPIDs Allocated
None
1 per B-channel
1 per B-channel
1 per device
1 per B-channel
1 per device
None
Definition
ViewStation User Guide