Polycom VSX Series Administrator's Manual page 186

Administrator's Guide for the VSX Series
Symptom
ISDN: Line Status icons do
not go away so video calls
cannot be made.
ISDN: When placing a call,
progress indicators do not
turn green.
ISDN: Calls cannot be
completed successfully.
The green light on the NT-1
device flashes slowly.
ISDN: Calls cannot be
completed successfully.
The green light on the NT-1
device flashes rapidly.
7 - 14
Problem
The system is not
connected to an ISDN.
The ISDN number is
entered incorrectly.
The ISDN line is
provisioned incorrectly by
the ISDN service provider.
The VSX system is in an
unknown state.
The Quad BRI network
interface is directly
connected to a U interface.
The Quad BRI network
interface is connected to an
NT-1 then to a PBX S/T
interface.
The system was not able to
auto-detect SPIDs, or the
SPID numbers are entered
incorrectly.
Note: The AT&T
point-to-point protocol does
not require SPIDs.
The call does not connect
properly.
The NT-1 device is not
powered on.
There is a problem with the
VSX system or between it
and the NT-1 device.
There is a problem on the
network side of the NT-1
device.
Corrective action
Check the ISDN line connections.
Check the ISDN numbers with your service provider.
Check that your ISDN line is provisioned for
Voice/Data.
Power off the system, wait five seconds, and power
on the system.
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 S/T interface. Connect the system directly to
the PBX S/T connection.
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.
Check with your ISDN service provider and enter the
SPIDs and switch protocol manually.
Note: The AT&T point-to-point protocol does not
require SPIDs.
Try the call again.
Verify power on the NT-1 device.
Check for other problems listed in this table.
Contact your ISDN service provider.