[Asterisk-Users] echo test application delay using the asterisk cli

[Steve Kann]

Esben Stien wrote:

>I'm trying to figure out why I get delay using the echo test
>application. I'm using the asterisk cli so I got no external factors
>that could interfere. I'm getting close to half a second delay
>speaking into the microphone and hearing it out through my speakers.
>
>I'm doing lots of audio work (sequencing and recording) so asterisk is
>definitely the problem. Of course, only thing running is asterisk and
>nothing special is using the cpu or any subsystems of the kernel, in
>case you ask.
>
>I'm using GNU/linux-2.6.10 on a p3-600 with emu10k1 spu (creative
>soundblaster live), now using asterisk cvs from only a week old. I've
>tried the distributions and many many cvs checkouts, but I'm getting
>no further. The source for app_echo.c is only 30 lines long and does
>nothing except writing out what it reads in. Mark Spencer, I'm
>lost. Where does the latency stem from?.
>
>Asking this on the asterisk irc channel gets me nowhere. I've tried
>many many times formulating it different ways, but few seems to
>understand I'm only using the interactive shell mode of asterisk
>dialing the echo application on the same server.
>  
>
There's probably lots of places where buffering is happening, but I'd 
look into chan_oss (if that's what you're using, you don't say), and how 
it uses your soundcard.

-SteveK