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chan_dahdi: PRI span status may stay "Down, Active" after a short alarm 

Upon a short PRI disconnection, libpri may maintain Q.921 layer 'up' and
may thus not send PRI_EVENT_DCHAN_DOWN / PRI_EVENT_DCHAN_UP events.
If pri_event_alarm() clears DCHAN_UP status bit upon alarm detection
and no Q.921 reconnection sequence occurs, chan_dahdi will keep
seeing span status "Down" at the end of alarm.

This patch modifies pri_event_alarm() in order to keep DCHAN_UP bit
unchanged. libpri will send a PRI_EVENT_DCHAN_DOWN event if it detects
a disconnection of Q.921 layer and this will clear DCHAN_UP if required.

ASTERISK-28615

Change-Id: Ibe27df4971fd4c82cc6850020bce4a8b2692c996
This commit is contained in:
Frederic LE FOLL 2019-11-07 18:54:22 +01:00
parent be4c6f3f35
commit faf353e931
1 changed files with 1 additions and 1 deletions
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2
channels/sig_pri.c
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@ -2241,7 +2241,7 @@ static void *pri_ss_thread(void *data)
void pri_event_alarm(struct sig_pri_span *pri, int index, int before_start_pri)
{
pri->dchanavail[index] &= ~(DCHAN_NOTINALARM | DCHAN_UP);
pri->dchanavail[index] &= ~DCHAN_NOTINALARM;
if (!before_start_pri) {
pri_find_dchan(pri);
}