[Asterisk-Dev] SIP Jitter Buffer Testing

[alex at pilosoft.com]

On Fri, 16 Sep 2005, George Pajari wrote:

> I have set up a separate server (dual P3 800) to play with this code and
> am using fax machines to do the testing since they are far more
> sensitive to jitter and packet loss than voice. If we can send and
> receive faxes reliably using G.711 ulaw over the public Internet then we
> know we have accomplished something.
> 
> It goes without saying that on most connections, getting faxes through
> without the jitter buffer is almost impossible. The jitterbuffer makes a
> phenomenal difference. But we are still experiencing more problems than
> we should and have some questions on how to best proceed.
No. You will *not be able to send/receive faxes over public intarweb using 
g.711*. Jitterbuffer or not. Stop trying. 

Jitterbuffer makes voice not suck by interpolating previous frames when 
frame is delayed. Obviously, this will do nothing to help faxes.

-alex