[asterisk-bugs] [Asterisk 0013891]: "empty" overlap-dial-in doesn't work

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13891 
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Reported By:                smurfix
Assigned To:                jpeeler
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Project:                    Asterisk
Issue ID:                   13891
Category:                   Core/PBX
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Asterisk Version:           SVN 
SVN Branch (only for SVN checkouts, not tarball releases): 1.6.1 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             2008-11-12 14:41 CST
Last Modified:              2008-11-13 13:09 CST
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Summary:                    "empty" overlap-dial-in doesn't work
Description: 
Some PRI callers (like the ancient telephone system we want to replace)
always send an empty SETUP message, and provide the actual number later.

Unfortunately, pbx_find_extension() is set to return NULL if it sees an
empty extension, thus preventing the call from ever completing.

I noticed the problem with DAHDI, but I suspect it's not limited to that.
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 (0094854) jpeeler (administrator) - 2008-11-13 13:09
 http://bugs.digium.com/view.php?id=13891#c94854 
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The original problem was "when # is pressed and nothing is pressed, the
code is currently trying to match on the extension '' and is falling
through". (Extracted from my chat logs - May 13. I should have done a
better commit message.) Reverting the code does not seem to have any
negative effects so I'm going to take it out. I originally thought the
change was OK to make as I thought it was mirroring the 1.4 behavior of
pbx_find_extension returning null when an extension string of zero length
is searched. More importantly perhaps I was not aware at the time that an
empty extension was ever possible. 

Issue History 
Date Modified    Username       Field                    Change               
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2008-11-13 13:09 jpeeler        Note Added: 0094854                          
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