[Asterisk-code-review] chan_dahdi: Don't allow MWI FSK if channel not idle. (asterisk[16])

[Kevin Harwell]

Kevin Harwell has submitted this change. ( https://gerrit.asterisk.org/c/asterisk/+/18493 )

Change subject: chan_dahdi: Don't allow MWI FSK if channel not idle.
......................................................................

chan_dahdi: Don't allow MWI FSK if channel not idle.

For lines that have mailboxes configured on them, with
FSK MWI, DAHDI will periodically try to dispatch FSK
to update MWI. However, this is never supposed to be
done when a channel is not idle.

There is currently an edge case where MWI FSK can
extraneously get spooled for the channel if a caller
hook flashes and hangs up, which triggers a recall ring.
After one ring, the on hook time threshold in this if
condition has been satisfied and an MWI update is spooled.
This means that when the phone is picked up again, the
answerer gets an FSK spill before being reconnected to
the party on hold.

To prevent this, we now explicitly check to ensure that
subchannel 0 has no owner. There is no owner when DAHDI
channels are idle, but if the channel is "in use" in some
way (such as in the aforementioned scenario), then there
is an owner, and we shouldn't process MWI at this time.

ASTERISK-28518 #close

Change-Id: Ia3904434fd81688d71742f7e84358b7e1c38e92a
---
M channels/chan_dahdi.c
1 file changed, 1 insertion(+), 0 deletions(-)

Approvals:
  Kevin Harwell: Looks good to me, but someone else must approve; Approved for Submit
  George Joseph: Looks good to me, approved



diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 6fb0eb2..4fc16e3 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -11573,6 +11573,7 @@
 							&& !analog_p->fxsoffhookstate
 							&& !last->owner
 							&& !ast_strlen_zero(last->mailbox)
+							&& !analog_p->subs[SUB_REAL].owner /* could be a recall ring from a flash hook hold */
 							&& (thispass - analog_p->onhooktime > 3)) {
 							res = has_voicemail(last);
 							if (analog_p->msgstate != res) {

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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: Ia3904434fd81688d71742f7e84358b7e1c38e92a
Gerrit-Change-Number: 18493
Gerrit-PatchSet: 2
Gerrit-Owner: N A <mail at interlinked.x10host.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
Gerrit-MessageType: merged
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