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Q.850 causes

Q.850 cause 19: No answer from user (user alerted)

No answer: the phone rang but nobody picked up within the time allowed.

19
Q.850 name
No answer from user (user alerted)
Group
Normal events
FreeSWITCH
NO_ANSWER
Asterisk
HANGUPCAUSE=19
SIP response from a gateway
480 Temporarily Unavailable
In SIP
Reason: Q.850;cause=19

Why it happens

What to check