[asterisk-bugs] [Asterisk 0016516]: gsm to ulaw transcoding sounds terrible

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=16516 
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Reported By:                ManChicken
Assigned To:                
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Project:                    Asterisk
Issue ID:                   16516
Category:                   Codecs/codec_gsm
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.6.1.12 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-12-26 15:32 CST
Last Modified:              2009-12-29 12:04 CST
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Summary:                    gsm to ulaw transcoding sounds terrible
Description: 
Playing back GSM files on a ulaw or alaw transport sounds horrible
(muffled, noise, cylon sounds, etc).  None of my handsets support GSM, but
the default voicemail setup records in wav/wav49/gsm - Under asterisk 1.4
it always played one of the wav's but after upgrading to 1.6.1.12 suddenly
voicemails were unintelligible as according to the console it was
preferring to play the GSM version and transcode to ulaw.

Tested further by taking any .gsm system sound, renaming it to something
unique and using Playback over a ulaw/alaw transport sounds the same
(awful).  However, ulaw->gsm sounds fine, using Record() to a gsm file and
playing it back over a gsm transport (softphone)
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 (0115823) ManChicken (reporter) - 2009-12-29 12:04
 https://issues.asterisk.org/view.php?id=16516#c115823 
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Sorry, this bug appears to be the same as
https://issues.asterisk.org/view.php?id=11243 - My system is running gcc
4.2 and this is solved by compiling with optimization at -O2 or off. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-12-29 12:04 ManChicken     Note Added: 0115823                          
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