Poor gsm playback - ReadList.com

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Poor gsm playback
\ John Fawcett (14 Dec 2007)
. \ Doug Lytle (14 Dec 2007)
. \ Tilghman Lesher (14 Dec 2007)
. . \ John Fawcett (14 Dec 2007)

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Subject:	Poor gsm playback
Group:	Asterisk-users
From:	John Fawcett
Date:	14 Dec 2007

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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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