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Chapter 8 - Troubleshooting
© Polycom, Inc. 2003 269
Network and Communications
Symptom Cause Solution
Error message occurs
when dialing a video
call.
If this is an H.320 call, the first line
did not connect. It cannot make a
call if the first line does not
connect.
Check that all network cables are
properly connected. Restart the
system.
Try to call alternate sites.
If this is an H.323 call, the IP
Gateway/Gatekeeper is not
operating or is not configured
correctly.
Contact your network administrator.
ISDN: Line Status icons
do not go away so video
calls cannot be made.
The ISDN line is not present. Check the ISDN line connections.
The system has an S/T interface and
requires an NT-1 to be connected
between the the system and your
ISDN line, unless the system is
connected to a PBX. See below.
The ISDN number is entered
incorrectly.
Check the ISDN numbers with your
service provider.
The SPID numbers are entered
incorrectly. Note: The AT&T
point-to-point protocol does not
require SPIDs.
Select the Clear icon on the Auto
Detect SPIDs page, and then select
the Start icon to automatically detect
the new SPIDs. Make sure your
ISDN numbers are entered correctly.
The system is directly connected
to a U interface.
Install an NT-1 between your ISDN
line and the ViewStation ISDN
connection.
ISDN: The Line Status
icons do not go away so
video calls cannot be
made.
The ViewStation is connected to
an NT-1 then directly to a PBX.
The PBX connection is an S/T
interface.
You do not need an NT-1 when
connecting to a PBX. Connect the
system directly to the PBX S/T
connection. You may need to use an
ISDN terminating resistor on the
ISDN line between your ViewStation
and the PBX.