[asterisk-bugs] [Asterisk 0014843]: 1 in 3 incoming zap PRI calls do no hear audio (are not bridged) when call is answered with agi script

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=14843 
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Reported By:                aragon
Assigned To:                
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Project:                    Asterisk
Issue ID:                   14843
Category:                   Resources/res_agi
Reproducibility:            sometimes
Severity:                   major
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.24 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-04-07 08:12 CDT
Last Modified:              2009-04-07 09:34 CDT
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Summary:                    1 in 3 incoming zap PRI calls do no hear audio (are
not bridged) when call is answered with agi script
Description: 
Incoming zap PRI call answers with DNIS and agi script
Some calls are answered properly with audio (bridged)
Sometimes caller hears no audio (not bridged)
Roughly 1 in 3 callers hears no audio.
No relation found to specific B channel

I'm opening as major because lots of calls are not being bridged.

Started with Asterisk 1.4.20 problem still in 1.4.24.1

zaptel-1.4.12
asterisk-1.4.24.1

The last line in the CLI keeps repeating until the caller hangs up

[Apr 6 19:35:18] NOTICE[26970]: utils.c:938 ast_carefulwrite: Timed out
trying to write
[Apr 6 19:35:18] NOTICE[26970]: utils.c:938 ast_carefulwrite: Timed out
trying to write

or 

[Apr 6 22:37:10] DEBUG[20731]: chan_sip.c:2226 __sip_ack: Stopping
retransmission on '7cd1530c5be721a24327004c5d520b3e at 10.0.50.254' of Request
102: Match Found
[Apr 6 22:37:10] DEBUG[20731]: chan_sip.c:4653 sip_alloc: Allocating new
SIP dialog for (No Call-ID) - OPTIONS
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---------------------------------------------------------------------- 
 (0102837) jvandal (reporter) - 2009-04-07 09:34
 http://bugs.digium.com/view.php?id=14843#c102837 
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Not fully sure, but maybe related to r165796 ? I have same problems on
multiple server causing issues with AGI scripts (ex. cannot get result of a
GET VARIABLE XYZ)

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r165796 | russell | 2008-12-18 16:39:25 -0500 (Thu, 18 Dec 2008) | 11
lines

Make ast_carefulwrite() be more careful.

This patch handles some additional cases that could result in partial
writes
to the file description.  This was done to address complaints about
partial
writes on AMI.

(issue http://bugs.digium.com/view.php?id=13546) (more changes needed to address
potential problems in 1.6)
Reported by: srt
Tested by: russell
Review: http://reviewboard.digium.com/r/99/ 

Issue History 
Date Modified    Username       Field                    Change               
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2009-04-07 09:34 jvandal        Note Added: 0102837                          
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