User guide

Troubleshooting the SCOPIA Gateway 173
Resolving ISDN Video Quality Issues
RESOLVING ISDN
VIDEO QUALITY
I
SSUES
This section describes what to do if you encounter poor video quality on the
ISDN endpoint.
The LAN network is suffering from
massive packet loss.
At Gateway > Settings > Advanced, verify
that Enable packet handling is checked, and
increase the value of the Network jitter
tolerance parameter if necessary.
If the problem is not resolved, contact
RADVISION Customer Support.
Provide the following information to
RADVISION Customer Support:
 Gateway traces with level 6.
 H.323 stack log.
 Gateway media recording.
 Ethereal trace of the Gateway.
Possible Causes Verification Steps
Possible Causes Verification Steps
The ISDN connection is not stable, and the
orange/yellow panel LEDs are steady or
flickering.
 Call your operator for help.
 Check your PABX.
ISDN endpoint problem. Make a call to other ISDN endpoints (from
the same vendor and from different
vendors). If the video quality is good, there
may be an interoperability problem with the
specific endpoint.
LAN endpoint problem. Make a call from another LAN endpoint. If
the video quality on the ISDN endpoint is
good, the problem lies with the LAN
endpoint you are calling from.
LAN problems. Make a LAN-to-LAN call and verify that
the LAN interface performance is
satisfactory (no packet loss, jitter or delay
issues occur). Check with the network
administrator if necessary.