RADVision SCOPIA 400, User Manual

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172 SCOPIA 400/1000 Gateway User Guide
Resolving Intermittent Call Failure
R
ESOLVING
I
NTERMITTENT
C
ALL
F
AILURE
This section describes what to do if calls intermittently fail to connect.
R
ESOLVING
IP
V
IDEO
Q
UALITY
I
SSUES
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.