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Cause Value 18 (0x12/0x920 - No user responding/No response from the remote device
The remote device/endpoint/PBX did not respond with an ALERTING/PROGRESS/CONNECT
indication within the time administered in the T303 or T310 timers Q.931 specification.
Cause Value 18 indicates high traffic conditions in the serving ISDN network or noisy conditions
on the T1/E1 span carrying the d-channel messaging. The noise is causing the loss of
messages being sent to the remote device. The remote device might also be unable to respond
to the incoming SETUP request.
This Cause Value has end-to-end significance and should always be passed back through the
network to the user.
G450/S8300/SES to AudioCodes MP-124.
Inbound:
denial event 1180: No user responding D1=0xe0011 D2=0x12
username="2057",realm="domain.domain",...
...
username="2054",realm="domain.domain",...
...
username="2056",realm="domain.domain",...