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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?
Only other things to note are that I am using mISDN and ztdummy (as
before) though last time I had also installed libpri - but never used it
so did not install this time.
thanks
John
new system
Translation times between formats (in milliseconds) for one
second of data
Source Format (Rows) Destination Format (Columns)
g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc
g726 g722
g723 - - - - - - - - - -
- - - -
gsm - - 2 2 2 2 1 5 - -
19 2 -
ulaw - 4 - 1 2 2 1 5 - -
19 2 -
alaw - 4 1 - 2 2 1 5 - -
19 2 -
g726aal2 - 4 2 2 - 2 1 5 - -
19 1 -
adpcm - 4 2 2 2 - 1 5 - -
19 2 -
slin - 3 1 1 1 1 - 4 - -
18 1 -
lpc10 - 5 3 3 3 3 2 - - -
20 3 -
g729 - - - - - - - - - -
- - - -
speex - - - - - - - - - -
- - - -
ilbc - 6 4 4 4 4 3 7 - -
- - 4 -
g726 - 4 2 2 1 2 1 5 - -
19 - -
g722 - - - - - - - - - -
- - - -
old system
g723 gsm ulaw alaw g726 adpcm slin lpc10 g729 speex ilbc
g723 - - - - - - - - - - -
gsm - - 2 2 2 2 1 5 - - 17
ulaw - 4 - 1 2 2 1 5 - - 17
alaw - 4 1 - 2 2 1 5 - - 17
g726 - 4 2 2 - 2 1 5 - - 17
adpcm - 4 2 2 2 - 1 5 - - 17
slin - 3 1 1 1 1 - 4 - - 16
lpc10 - 5 3 3 3 3 2 - - - 18
g729 - - - - - - - - - - -
speex - - - - - - - - - - -
ilbc - 5 3 3 3 3 2 6 - -
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John Fawcett wrote:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > 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 >http://lists.digium.com/pipermail/asterisk-users/2007-November/201250.html Doug
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