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