User guide

172 SCOPIA 400/1000 Gateway User Guide
Resolving Intermittent Call Failure
RESOLVING
INTERMITTENT
C
ALL FAILURE
This section describes what to do if calls intermittently fail to connect.
RESOLVING IP
V
IDEO QUALITY
ISSUES
This section describes what to do if you encounter poor video quality on the IP
endpoint on your LAN.
Possible Causes Verification Steps
PRI/E1 line is fractional. Check with the PRI line provider if the
PRI/E1 line is a fractional line (Economy
PRI/E1 in the UK).
If so, At Gateway > Port > Physical
Interface set the Fractional button to use
the correct channels only.
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.
Possible Causes Verification Steps
The LAN port of the unit is not
synchronized with the LAN switch.
Hard code both the Gateway and the switch
to 100Mb/Full Duplex at Gateway > Board
(or Device) > Addressing > Port settings
Call rate problem.
 In LAN-to-ISDN calls, verify that
you are using the correct service
prefix set with correct bit rate in
the Gateway.
 In Gateway > Settings >
Advanced, verify that the Ignore
bearer rate and force service rate
option setting is not the cause.
Packet loss and packet reordering,
re-transmission, jitter or delay.
Verify that the LAN interface performance
is satisfactory (no packet loss, jitter or
delay issues occur). Check with the
network administrator if necessary.