[asterisk-bugs] [JIRA] (ASTERISK-22191) wrong timing for periodic announcement in queue

[c0rnoTa (JIRA)]

c0rnoTa created ASTERISK-22191:
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             Summary: wrong timing for periodic announcement in queue
                 Key: ASTERISK-22191
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22191
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Applications/app_queue
    Affects Versions: 1.8.22.0
         Environment: OS Linux Gentoo x86_64 on hardware server DL180
Realtime SIP agents in queue with strategy ringall.
            Reporter: c0rnoTa
            Severity: Minor


Was spotted an error in the calculation of the periods of periodic-announcement in the queues. It is not the difference in the calculation of the time when the operators are free or unavailable. I am talking about a point of reference when timer starts counting next period.
In my understanding, periodic notification should play after a specified period of time taking into account the duration of the playback file. Actually, the way it often happens.
It calls to agents then comes the specified periodic-announce-frequency time, it playing a notification, and then starts timer to count next periodic-announce-frequency.
Sometimes, for unknown reasons to me, the beginning of the reference period of announcement is the end of the previous period, and not the end of the played announcement.
Is there a reason why the starting point of periodic-announce-frequency may change?
The way it looks in verbose you can find in the attachment.

periodic-announce-frequency=20
periodic announce duration is 15 secs.

At Jul 16 18:18:17 periodic announcement starts, at Jul 16 18:18:31 it ends.
At Jul 16 18:18:51 starts (after 20 seconds) - at Jul 16 18:19:05 it ends.
At Jul 16 18:19:11 it starts (after 6 secons)- Jul 16 18:19:26 it ends.


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