Polycom VS4000 Administrator's Manual page 137

Symptom
ISDN calls:
ISDN Line Status
icons do not turn
green so ISDN calls
cannot be
completed.
System displays a
message indicating
network congestion
when placing an
ISDN call
immediately after
starting the system
Cannot make
bonding calls. (The
call progress circles
only show blue or
yellow.)
© Polycom, Inc.
System Cause
All The call is not connecting
properly.
The system is not connected
to an ISDN network.
The ISDN number or SPID
numbers are entered
incorrectly.
Note: The AT&T point-to-point
protocol does not require
SPIDs.
The system was not able to
auto-detect SPIDs.
The Quad BRI network
interface module is directly
connected to a U interface.
The system is connected to an
NT-1 then to a PBX.
The ISDN line is provisioned
incorrectly by the ISDN
network service provider.
All This can occur if the system
uses a PRI E1 network
interface module that is
connected to an Adtran Atlas
800 Plus module. After power
on, the Adtran module must
complete channel restarts
before the system can
complete ISDN calls.
All Switch protocol issue.
Chapter 7 - Diagnostics and General Troubleshooting
Solution
Try the call again.
Check the ISDN line connections.
Make sure your ISDN numbers are
entered correctly. Check the ISDN
numbers with your service provider.
Select the Clear icon on the Auto
Detect SPIDs page, and then select the
Start icon to automatically detect the
new SPIDs.
Check with your ISDN service provider
and enter the SPIDs and switch
protocol manually.
Install an NT-1 device between your
network interface module and the ISDN
connection.
You do not need an NT-1device when
connecting to a PBX. Connect the
system directly to the PBX S/T
connection.
Check that your ISDN line is
provisioned for Voice/Data, Voice/Data.
Wait about three minutes and try the
call again.
Start by calling the far site at 1x56,
1x64, 2x56, or 2x64 Kbps, as
appropriate. This will verify the primary
number. If these calls complete, try 256
Kbps, then 384 Kbps.
Being able to make non-bonded calls
but not bonded calls to all locations is
usually a switch protocol issue. Verify
your ISDN provisioning with the
telephone service provider.
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