[SIPForum-discussion] what is the rate atwhichdataistransmitted inVOIP

[sukerry at 126.com]

Hemant Mehar{WP130,199}

There is no restrictions in RTP packet length. for example , the frame length of gsm codec is 33, we can fill a rtp packet with 4 gsm frames (4*33=132 bytes).

{WP240,130}ð




hi, 
How will u put  multiple audio frames in a RTP packet.. because whatever codec we r using that is fixed. is multiple bitrate codec available???



Thanks & Regards
Hemant K. Mehar




"sukerry" <sukerry at 126.com> 
Sent by: discussion-bounces at sipforum.org 
01/24/2007 07:26 PM 
To"imran at smart-it-engineering.com" <imran at smart-it-engineering.com>, "harish T" <harish0611 at gmail.com>, "discussion at sipforum.org" <discussion at sipforum.org> 
cc
SubjectRe: [SIPForum-discussion] what is the rate at which         dataistransmitted in VOIP







Imran M Yousuf{WP130,199} 
  
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 

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{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}sukerry 
{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}ðsukerry at 126.com 
{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}2007-01-24 
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{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}ðsukerry
{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}ðsukerry at 126.com
{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}{WP240,130}{WP130,240}2007-01-25
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