[Asterisk-Users] internet bandwidth (comparing overhead)

[alexandre::aldeia digital]

Hi,

I like to know why iLBC and GSM generate a 40-50kbps bandwidth....
Is very high, if compared with your calculations for other codecs(G723.1 
/ 17kbps and G729 / 24 Kbps).


Alexandre

Kanuri, Seshu (Company IT) wrote:
> /SNIP/
> Some corrections are needed: 6.3kbps of G723.1 will become around 17kbps
> on the IP level without silence suppression because of the additional
> overhead imposed by protocols like RTP, IP, etc . If you add the
> Ethernet (or WAN protocol overhead) this will increase even more
> (although slightly).
> 
> Similarly, a voice stream of G729 at 8kbps will become around 24kbps on
> the IP level, and slightly more on the Ethernet or ppp level (around 25
> kbps).