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

[Imran M Yousuf]

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
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