[asterisk-bugs] [Asterisk 0012093]: Listening to Allison voicemail prompt on SIP phone causes [pop] sounds

[noreply at bugs.digium.com]

The following issue has been ASSIGNED. 
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http://bugs.digium.com/view.php?id=12093 
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Reported By:                mustardman
Assigned To:                qwell
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Project:                    Asterisk
Issue ID:                   12093
Category:                   Sounds
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.18 
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:             02-27-2008 17:57 CST
Last Modified:              03-26-2008 18:22 CDT
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Summary:                    Listening to Allison voicemail prompt on SIP phone
causes [pop] sounds
Description: 
This is something that has been bugging me for awhile.  I have noticed it
on multiple systems with different hardware, different brands and models of
hardphones, with and without zaptel cards, and various versions of Asterisk
in the 1.2 and 1.4 branches.

A bit hard to describe.  Using a SIP hardphone I log into my voicemail at
which point Allison says "you have x messages.....".  There are various
other prompts that exhibit the same problem that are not necessarily part
of voicemail but that is one easy to explain and reproduce one. The problem
is there is a slight 'pop' sound usually during the first syllable of each
word.  So the prompt sounds like "y[pop]ou h[pop]ave t[pop]wo
me[pop]ssages".  If I dial *43 to do an echo test and Allison says "you are
about to enter an echo test....." it's not there so it's only in certain
modes this happens.

It's relatively minor and not something people generally complain about
but it's definitely there and (at least to me) kinda makes the system seem
to be a bit less polished sounding.  I thought it had something to do with
the prompts I am using but when I play back the actual files in a sound
player I don't hear those pops.  I tried using various format prompts
including gsm, ulaw etc. but it doesn't change anything.

This problem has always been there for as long as I can remember.  Doesn't
matter what version Asterisk/Zaptel/Sounds I am using.


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---------------------------------------------------------------------- 
 svnbot - 03-26-08 18:22  
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Repository: asterisk
Revision: 111245

U   branches/1.4/main/frame.c

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r111245 | qwell | 2008-03-26 18:22:12 -0500 (Wed, 26 Mar 2008) | 9 lines

Remove excessive smoother optimization that was causing audio glitches
(small "pops")
 after (about 200ms later) an "incorrectly" sized frame was received.

While it would be very nice to keep this as optimized as possible, it
makes no sense
 for the smoother to be dropping random bits of audio like this.  Isn't
that the
 whole point of a smoother?

Closes issue http://bugs.digium.com/view.php?id=12093.

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http://svn.digium.com/view/asterisk?view=rev&revision=111245 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
03-26-08 18:22  svnbot         Checkin                                      
03-26-08 18:22  svnbot         Note Added: 0084630                          
03-26-08 18:22  svnbot         Status                   new => assigned     
03-26-08 18:22  svnbot         Assigned To               => qwell           
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