[Asterisk-code-review] chan dahdi: Add the chan dahdi.conf force restart unavailabl... (asterisk[master])

[Joshua Colp]

Joshua Colp has uploaded a new patch set (#2).

Change subject: chan_dahdi: Add the chan_dahdi.conf force_restart_unavailable_chans option.
......................................................................

chan_dahdi: Add the chan_dahdi.conf force_restart_unavailable_chans option.

Some telco switches occasionally ignore ISDN RESTART requests.  The fix
for ASTERISK-19608 added an escape clause for B channels in the restarting
state if the telco ignores a RESTART request.  If the telco fails to
acknowledge the RESTART then Asterisk will assume the telco acknowledged
the RESTART on the second call attempt requesting the B channel by the
telco.  The escape clause is good for dealing with RESTART requests in
general but it does cause the next call for the restarting B channel to be
rejected if the telco insists the call must go on that B channel.

chan_dahdi doesn't really need to issue a RESTART request in response to
receiving a cause 44 (Requested channel not available) code.  Sending the
RESTART in such a situation is not required (nor prohibited) by the
standards.  I think chan_dahdi does this for historical reasons to deal
with buggy peers to get channels unstuck in a similar fashion as the
chan_dahdi.conf resetinterval option.

* Add the chan_dahdi.conf force_restart_unavailable_chans compatability
option that when disabled will prevent chan_dahdi from trying to RESTART
the channel in response to a cause 44 code.

ASTERISK-25034 #close
Reported by: Richard Mudgett

Change-Id: Ib8b17a438799920f4a2038826ff99a1884042f65
---
M CHANGES
M channels/chan_dahdi.c
M channels/sig_pri.c
M channels/sig_pri.h
M configs/samples/chan_dahdi.conf.sample
5 files changed, 24 insertions(+), 13 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/05/305/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ib8b17a438799920f4a2038826ff99a1884042f65
Gerrit-PatchSet: 2
Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Owner: Richard Mudgett <rmudgett at digium.com>
Gerrit-Reviewer: Richard Mudgett <rmudgett at digium.com>