[asterisk-bugs] [Asterisk 0011335]: Hook-Flash behaviour results in echo-cancellation disabled on channel during call.

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=11335 
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Reported By:                rebuild
Assigned To:                
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Project:                    Asterisk
Issue ID:                   11335
Category:                   Channels/chan_zap
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.14  
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             11-21-2007 06:39 CST
Last Modified:              11-21-2007 06:41 CST
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Summary:                    Hook-Flash behaviour results in echo-cancellation
disabled on channel during call.
Description: 

With asterisk 1.4.11, during a standard call, 'zap show channel 1' reports
echo cancellation as 'ON'.  With call waiting, accepting the second call
keeps echo cancellation as expected.

When on a single call, pressing hook-flash to get a second dial tone turns
off echo cancellation.   If you successfully dial another number, echo
cancellation is renegotiated, and is set correctly for that call.   Hanging
up, will result in the call on hold 'calling back' the hand set.  When you
pick up the hand set, you hear a screech, and 'zap show channel 1' shows
echo cancellation as disabled, and you hear echo during the call after
resuming.
  
Upgrading to 1.4.12/13/14 changed this behaviour slightly.   Now echo
cancellation is disabled by hook-flash, and remains disabled, even when
hook-flash is used to resume the call on hold.

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---------------------------------------------------------------------- 
 rebuild - 11-21-07 06:41  
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NOTE.

If you vary the above sequence.
1) call echo test
2) hook flash
3) listen for dial tone.
4) zap show channel 1 shows echo cancellation OFF.
5) press hook flash
6) resume call
7) zap show channel 1 shows echo cancellation ON.

This applies to 1.4.11 only.
Asterisk 1.4.12 and above show echo cancellation OFF at step 7 

Issue History 
Date Modified   Username       Field                    Change               
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11-21-07 06:41  rebuild        Note Added: 0074130                          
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