Jon Carnes wrote:
Come on now, Mark! We have a lot to add to a conversation like this
(when we aren't too busy deploying Asterisk in the *Real World* to read
the list...)
Aaron is quite correct... academically... about bandwidth used by G711
and G729 codecs. However in the real world we see rates of around 12 to
20 kbs for typical G729 connections. In fact we regularly use 20kbs as
our benchmark and we have never overshot that mark. 12kbs is much more
typical.
I'm sure Aaron knows why the real world scenario is much less - and I'll
give him a moment of silence to illuminate us! :-)
So where are you measuring that 20kbs? If you're measuring it as 20kbs
of layer2 bandwidth consumed (ie. ethernet frames, what ifconfig,
iptables, or the interface counters on a switch or router will show
you), you'll see I cited the upper bound as 23.2kb/s. This accounts for
the MAC header as well as the IP/UDP header. The reason you're probably
seeing 12kbs as a low-end average is things like VAD or G.729b (aka
silence suppression) that knocks out about 50% of the bandwidth for your
average conversation.
Aaron S. Joyner
On Wed, 2006-05-31 at 12:29, Mark Turner wrote:
Yeah ... what he said!
Mark
Aaron S. Joyner wrote:
Mark Turner wrote:
Comments below.
Brian Henning wrote:
I figure the easiest way is to set up an Asterisk server here, attach
it to our existing PBX to show up as another extension, and push an
asterisk session (is that good terminology?) through an SSH tunnel
(or is that a bad idea?) to the remote employee's broadband-equipped
machine, which will sport a cheap headset/boom mic arrangement.
[miscellaneous geek-prize-winning wisdom snipped]
A link - submitted for your approval.
(and hidden at the end of the email):
http://www.cisco.com/warp/public/788/pkt-voice-general/bwidth_consume.htm
Jon
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