[Asterisk-code-review] chan_pjsip: Incorporate channel reference count into transfer_refer(). (asterisk[18])

[Dan Cropp]

Attention is currently required from: Dan Cropp.
Hello Joshua Colp, George Joseph, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/15196

to look at the new patch set (#4).

Change subject: chan_pjsip: Incorporate channel reference count into transfer_refer().
......................................................................

chan_pjsip: Incorporate channel reference count into transfer_refer().

Add channel reference count for PJSIP REFER. The call could be terminated
prior to the result of the transfer. In that scenario, when the SUBSCRIBE/NOTIFY
occurred several minutes later, it would attempt to access a session which was
no longer valid.  Terminate event subscription if pjsip_xfer_initiate() or
pjsip_xfer_send_request() fails in transfer_refer().

ASTERISK-29201 #close
Reported-by: Dan Cropp

Change-Id: I3fd92fd14b4e3844d3d7b0f60fe417a4df5f2435
---
M channels/chan_pjsip.c
1 file changed, 26 insertions(+), 18 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/96/15196/4
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Gerrit-Project: asterisk
Gerrit-Branch: 18
Gerrit-Change-Id: I3fd92fd14b4e3844d3d7b0f60fe417a4df5f2435
Gerrit-Change-Number: 15196
Gerrit-PatchSet: 4
Gerrit-Owner: Dan Cropp <dan at amtelco.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Attention: Dan Cropp <dan at amtelco.com>
Gerrit-MessageType: newpatchset
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