[Asterisk-Users] Calculating required bandwidth

[Andrew Kohlsmith]

On December 16, 2004 03:49 pm, Race Vanderdecken wrote:
> Also remember that a telephone conversation is 2/3's silence. ( I speak,
> silence, then you speak. See the book at bought on Amazon 4 years ago
> but can't remember the name of the book.)IP only sends the data when
> there is noise versus the T1 which is a constant TDM stream. So I

Incorrect.  Only when VAD is active is silence supression used.  Asterisk does 
not currently support VAD in any form since the RTP stream is used as a clock 
source.

> predict in testing with good VoIP equipment you can get more then 24
> G.711 calls per T1. So take that and comment. You should be able to get
> more VoIP calls, my prediction is 40 G.711 well behaved calls with
> silence suppression per T1. Why else would the Baby Bells move to VoIP?

Because they'll transcode to GSM (minimum) and call it toll quality?  :-)  

-A.