User guide

Troubleshooting the SCOPIA Gateway 169
Resolving ISDN-to-IP Call Failure
RESOLVING
ISDN-TO-IP CALL
F
AILURE
This section describes what to do if ISDN-to-IP calls fail to connect.
Note In this section we assume that the LAN endpoint is an H.323 endpoint.
Possible Causes Verification Steps
The LAN endpoint does not appear in the
gatekeeper list of registered H.323
endpoints.
Make sure that the LAN endpoint is
properly registered with the gatekeeper,
and make the call again.
ISDN Central Switch/PBX/PABX call
routing problem.
 Open a Telnet connection to the
Gateway.
 Make an ISDN-to-IP call.
 Verify whether the call reaches
the Gateway.
 If the call does not reach the
Gateway, ask the ISDN provider
to check the ISDN Central
Switch/PBX/PABX call routing
rules.
The Gateway DID option is checked but
there is no endpoint with such a DID
number on the LAN.
 Check that a LAN endpoint with
the same DID number is
registered with the gatekeeper.
 Check the Gateway log and make
sure that the ISDN network
delivered the correct Called Party
Number to the Gateway.
 You may need to redefine the
LAN endpoint E.164 number
accordingly (sometimes the
ISDN network is set to deliver
only the last 3-5 digits).
 Make a call to another properly
registered endpoint to see if the
source of the problem is the
Gateway or the endpoints.