[asterisk-bugs] [Asterisk 0013745]: Recordings out of sync when using chanspy

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13745 
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Reported By:                geoffs
Assigned To:                mmichelson
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Project:                    Asterisk
Issue ID:                   13745
Category:                   Applications/app_mixmonitor
Reproducibility:            sometimes
Severity:                   major
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           1.4.22 
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:             2008-10-20 09:31 CDT
Last Modified:              2009-03-27 08:20 CDT
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Summary:                    Recordings out of sync when using chanspy
Description: 
Inbound and outbound tracks will get out of sync by several seconds when a
call is monitored using chanspy.  
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Relationships       ID      Summary
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related to          0012837 [patch] Chanspy audio is delayed or lost
related to          0011945 MixMonitor - Out Of Sync Audio With Zap...
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 (0102291) geoffs (reporter) - 2009-03-27 08:20
 http://bugs.digium.com/view.php?id=13745#c102291 
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Our evaluation group has now monitored and QC'd about 5000 calls with these
results: 1) the delay in recordings is either minimal (can't detect
audibly) or fixed.  Evaluators listening to calls live and comparing them
to recordings the next or same day report there is no delay in the
recordings even if the callee end is delayed while monitoring (chan_spy). 
B) Spied calls exhibit less delay and it occurs less frequently but it is
definitely still there.  Using the * to release and immediately reconnect
to the call re-syncs the channels for a time but they do eventually go back
out of sync.  The longest delay observed is 5 seconds over the course of a
30 minute call.  Delay is not observed until at least 5 minutes into a call
and it is a very gradual process.

Hope this helps. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-03-27 08:20 geoffs         Note Added: 0102291                          
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