[Asterisk-biz] voip VPN solution requirement

[steve szmidt]

On Monday 02 May 2005 05:09, Jean-Michel Hiver wrote:
> >This sounds almost impossible. In standard carrier grade voice
> > transmission you can pass 31 calls with 2 Megs (64 kbit/s per call). In
> > your case you have 21kbit/s per call. Plus you want this encrypted, which
> > means you will have even less quality. You can do it, but you will loose
> > a lot of frequency.
> >Loosing frequencys means one can not hear the  temper of the caller.
>
> 64kbits/s is the theoretical bandwith for g.711. Using g.729, you need
> 8kbps. Of course when you add UDP + IP it comes to about 24kbps - but
> that's when IAX trunking kicks in.

Hmm, I only get to just about 19.2K load with everything (g.729).

-- 

Steve Szmidt

"They that would give up essential liberty for temporary safety 
deserve neither liberty nor safety."
                                Benjamin Franklin