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chan_dahdi: Add the chan_dahdi.conf force_restart_unavailable_chans option.

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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
This commit is contained in:
Richard Mudgett
2015-04-29 14:29:10 -05:00
committed by Joshua Colp
parent 37a193da18
commit d3c310a28c
5 changed files with 29 additions and 13 deletions
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2
channels/sig_pri.h
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@@ -496,6 +496,8 @@ struct sig_pri_span {
#if defined(HAVE_PRI_MCID)
/*! \brief TRUE if allow sending MCID request on this span. */
unsigned int mcid_send:1;
/*! \brief TRUE if forcing RESTART when receive cause 44 on this span. */
unsigned int force_restart_unavailable_chans:1;
#endif /* defined(HAVE_PRI_MCID) */
#if defined(HAVE_PRI_DATETIME_SEND)
/*! \brief Configured date/time ie send policy option. */