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Bandwidth calculation in cisco call manager

Posted on 2009-04-22
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Last Modified: 2012-05-06
This is a Cisco Call MANAGER Question.

Given the following how do I calculate number of audio and video calls between two locations?

From Region configuration:
Codec used G.729
Video call bandwidth=384kbps

From Location configuration:
Audio bandwidth=512kbps
video Bandwidth=768kbps

Thanks,

Abnel
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Question by:Abnel
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Expert Comment

by:ehatchell
ID: 24211835
G729 is about ~40k per call.  So, if you have 512k for audio, you can do 12 calls at any given moment.
However, I see video is 384k (which is a common video setting per video conf), which is fine, but 768k is not enough for 2 streams because you need to factor in overhead (for multipoint sessions).  Use 420k or so for overhead per video stream.
Cheers.
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Author Comment

by:Abnel
ID: 24212838
Hi,

I am a bit confused, thought  G.729  is 24kbps uncompressed, and 8kbps compressed. Can you explain me why you said 40? I do not have good knowledge with various CODECs.

Thanks
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Accepted Solution

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ehatchell earned 750 total points
ID: 24215949
Aside from the voice payload, there are other elements for budgeting for voice packets.  In general, 40k is a fair budget for this codec.
There are various formulas here:
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml#formulae
You'll see Ethernet bandwidth in the table all the way to the right.  I know there are various flavors of g729, but 40k is a fair estimate most people use.
Regards
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Author Closing Comment

by:Abnel
ID: 31573552
Thank you for your support, the link you provided is also very helpful,

Cheers
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