[SIPForum-discussion] what is the rate at which data istransmitted in VOIP

[sukerry]

Imran M Yousuf，

I think we can make ip bitrate slow substantially by put multiple audio frames in a RTP packet.


Dear Harish,

As far as my knowledge goes in VoIP the BITRATE depends on the Codec being used. And there are 2 terms commonly used "codec bitrate" and "IP bitrate". In traditional telephone line the code used is PCM, which has codec bitrate 64kbps but its IP bitrate or bandwidth is much more, 80kbps. Coded birate is bitrate without the IP header. 
The 2 most widely used codec in VoIP is G.729 which has a Codec B/W 8kbps but its IP B/W is 24kbps (10s payload) and the other is G.723.1, which again has 2 variations of codec bit rate 5.6kbps and 6.4kbps and their respective IP B/Ws' are 16.27kbps and 17.07kbps.
Please see the following articles to gather more information about them.


http://www.erlang.com/bandwidth.html 
http://www.cliconnect.com/Articles/VoIPBandwidthRequirements.html

Thank you,


Imran M Yousuf
Enterpreneur & Lead Developer 
Smart IT Engineering
Dhaka, Bangladesh
Email: imran at smart-it-engineering.com 
Mobile: +880-1711402557 

= = = = = = = = = = = = = = = = = = = = = = 
　　　　　　　　　　　　　　　　　　　　　sukerry
　　　　　　　　　　　　　　sukerry at 126.com
　　　　　　　　　　　　　　　2007-01-24
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20070124/c004dd3f/attachment-0002.html>