Polycom VSX Series Administrator's Manual page 196

Administrator's Guide for the VSX Series
Symptom
No audio at your site.
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7 - 24
Problem
ISDN voice algorithm is
incorrect.
A single monitor VGA
configuration does not have
an external audio system.
The monitor's audio inputs
are not connected properly.
The system's audio outputs
are not connected properly.
Corrective action
Go to System > Admin Settings > Network > ISDN.
Change the ISDN Voice Algorithm selection (aLaw
or uLaw).
Check the system's audio connections to the
external audio system.
Check audio output using the Speaker Test screen
under Diagnostics > Audio. You should hear a 400
Hz tone.
Ask someone at the far site to speak into the
microphone, and check the Far Site Audio meter on
the Audio Meter screen under Diagnostics > Audio
to determine whether your system is receiving audio.
Check the system's audio connections to the
monitor, or to the external audio system if one is
connected.
Verify that the system is connected to the correct
audio connectors on the monitor.