User guide

Troubleshooting the SCOPIA Gateway 167
Checking Your ISDN Environment
CHECKING YOUR
ISDN
E
NVIRONMENT
This section describes how to verify that your ISDN network connection is
operating correctly.
RESOLVING
IP-TO-ISDN CALL
F
AILURE
This section describes what to do if IP-to-ISDN calls fail to connect.
Verification Steps
 Check that the video endpoint is ISDN enabled and has ISDN lines connected
and properly configured for bonding calls.
 Make an ISDN-to-ISDN call and verify the video and audio quality.
 At Gateway > Port verify that all necessary ISDN ports are enabled.
 At Gateway > Board (or Device) > LED Monitoring verify that the CD LED is
steady green. If it is off, check the ISDN physical layer setting.
 At Gateway > Port > Physical Interface confirm proper country selection,
signaling protocol and network access settings (TE is most commonly used).
 Some Central Switches/PBXs/PABXs require Double Framing or Extended
CRC4 framing. At Gateway > Port > Physical Interface > Advanced confirm
proper framing selection.
Possible Causes Verification Steps
The Gateway is not registered to the
gatekeeper.
 Verify at Gateway > Settings > IP
Connectivity that the Gateway is
in Using gatekeeper mode and not
in Peer-to-Peer mode.
 Verify at Gateway > Settings > IP
Connectivity that the gatekeeper
IP address is correct.
 When using more than one
Gateway, verify that each
Gateway has a unique registration
name.
The LAN endpoint dialed the wrong
Gateway access prefix.
Confirm that the correct Gateway service
prefix is used.
The H.320 endpoint is unavailable or busy,
or there is an ISDN connection problem.
Make a direct video call to the ISDN
endpoint from another ISDN endpoint to
identify whether the source of the problem
is the ISDN endpoint or the Gateway.