[asterisk-bugs] [Asterisk 0018509]: [patch] Sending out unnecessary PROCEEDING messages breaks overlap dialing

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18509 
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Reported By:                wimpy
Assigned To:                rmudgett
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Project:                    Asterisk
Issue ID:                   18509
Category:                   Channels/chan_dahdi
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     closed
Asterisk Version:           SVN 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases):  trunk 
SVN Revision (number only!):  
Request Review:              
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             2010-12-21 02:30 CST
Last Modified:              2011-01-25 11:42 CST
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Summary:                    [patch] Sending out unnecessary PROCEEDING messages
breaks overlap dialing
Description: 
chan_dahdi sends out a PROCEEDING message as soon as a call has a match in
the dialplan.
I think sending this message is unnecessary and can be harmful.
I think it should only be sent when Dial() is called with a definitive
destination.

So far I thought chan_dahdi was unable to do outgoing overlap dialing, but
I just found out that it does, but sabotages itself.

If you have an
exten => _N!,1,Dial(dahdi/g1/${EXTEN})
and use overlap dialing, the trouble is that you get a PROCEEDING after
you dialed the first digit which will tell the phone that dialing has
finished.

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Relationships       ID      Summary
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related to          0016789 [patch] Overlap receiving timeout, plus...
has duplicate       0017085 [patch] [regression] Overlap dialing to...
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 (0131029) svnbot (reporter) - 2011-01-25 11:42
 https://issues.asterisk.org/view.php?id=18509#c131029 
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Repository: asterisk
Revision: 303769

_U  branches/1.6.2/
U   branches/1.6.2/channels/chan_dahdi.c

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r303769 | rmudgett | 2011-01-25 11:42:43 -0600 (Tue, 25 Jan 2011) | 47
lines

Merged revisions 303765 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r303765 | rmudgett | 2011-01-25 11:36:50 -0600 (Tue, 25 Jan 2011) | 40
lines
  
  Sending out unnecessary PROCEEDING messages breaks overlap dialing.
  
  Issue https://issues.asterisk.org/view.php?id=16789 was a good idea. 
Unfortunately, it breaks overlap dialing
  through Asterisk.  There is not enough information available at this
point
  to know if dialing is complete.  The ast_exists_extension(),
  ast_matchmore_extension(), and ast_canmatch_extension() calls are not
  adequate to detect a dial through extension pattern of "_9!".
  
  Workaround is to use the dialplan Proceeding() application early in
  non-dial through extensions.
  
  * Effectively revert issue https://issues.asterisk.org/view.php?id=16789.
  
  * Allow outgoing overlap dialing to hear dialtone and other early media.
  A PROGRESS "inband-information is now available" message is now sent
after
  the SETUP_ACKNOWLEDGE message for non-digital calls.  An
  AST_CONTROL_PROGRESS is now generated for incoming SETUP_ACKNOWLEDGE
  messages for non-digital calls.
  
  * Handling of the AST_CONTROL_CONGESTION in chan_dahdi/sig_pri was
  inconsistent with the cause codes.
  
  * Added better protection from sending out of sequence messages by
  combining several flags into a single enum value representing call
  progress level.
  
  * Added diagnostic messages for deferred overlap digits handling corner
  cases.
  
  (closes issue https://issues.asterisk.org/view.php?id=17085)
  Reported by: shawkris
  
  (closes issue https://issues.asterisk.org/view.php?id=18509)
  Reported by: wimpy
  Patches:
        issue18509_early_media_v1.8_v3.patch uploaded by rmudgett (license
664)
        Expanded upon issue18509_early_media_v1.8_v3.patch to include
analog
        and SS7 because of backporting requirements.
  Tested by: wimpy, rmudgett
........

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http://svn.digium.com/view/asterisk?view=rev&revision=303769 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-01-25 11:42 svnbot         Checkin                                      
2011-01-25 11:42 svnbot         Note Added: 0131029                          
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