[asterisk-users] Poor gsm playback

[Tilghman Lesher]

On Friday 14 December 2007 00:41:18 John Fawcett wrote:
> I've have installed a new Asterisk 1.4.15 system after having previously
> used a 1.2 CVS head (from 10 Sep 2005). Both systems are pentiums though
> the newer one is actually a slower processor.
>
> On the new system, playback of gsm files is noticeably poorer (voice
> quality is flakely) on any connected phone (sip or isdn, internal or
> external).
>
> Prompts recorded in sln are very clear quality as are voicemail recorded
> in wav. Call quality is also good.
>
> "core show translation" show "gsm=>other format" times are similar to
> old system.
>
> what could be the reason for the poor performance of gsm? How could I
> investigate it?

gcc 4.2 has a bad optimization that has yet to be tracked down, which causes
the transcoding code to be incorrectly built.  There are two workarounds for
this problem:  either use gcc 4.1 or enable the DONT_OPTIMIZE compiler option
in 'make menuselect'.

-- 
Tilghman