just seen you use an hp thin client, I just got a hp 5500 via 800Mhz
one.
what's the way to install astlinux on it?
Soekris as you said is not powefull enough for the transcoding when
having more than 2 or 3 simultaneous calls.
Regards,
Olivier
Michael Graves a écrit :
Carla,
There can be both performance and licensing issues. G.729a is the most
widely used high quality compressed codecs, but you needs to buy
licenses from Digium...$10 per stream. Digium provides this as a
service, passing the license fees on to the patent holder.
It's CPU intensive so a Soekris Net4801 will only encode/decode two
calls using G.729a. I presently run Astlinux on a H-P T5700 thin client
with a 1 GHz CPU. It can transcode 5-6 calls. See voip-info.org for
"system dimensioning" to see details on larger systems.
There are DSP cards that can add to suitable hosts to move the
transcoding activity off the host CPU. These are good but costly
solutions.
As a practical matter if you're dealing with known ITSPs or peers then
you should be able to limit the codecs required and G.729s may not be
an issue. In fact ILBC may not be an issue. G.711a/u and GSM get it
done for a lot of providers.
Michael
On Tue, 5 Dec 2006 22:40:40 -0800, Carla Schroder wrote:
Gah, so it depends on whatever the people calling my network are using? Is
there any downside to allowing all codecs, like performance issues? Assume a
magical world with no licensing hassles for proprietary codecs. :)
On Tuesday 05 December 2006 18:38, Michael Graves wrote:
Carla,
The system will offer to negotiate a connection with the allowed
codecs. If it cannot then the call will simply be refused. You can
allow GSM and ILBC as these are royalty free and commonly used. If you
find that ILBC calls are poor quality you can always rem out that line
later on.
Noe also that you can specify the codecs in the general section and
also on a per peer basis.
Michael
On Tue, 5 Dec 2006 18:02:24 -0800, Carla Schroder wrote:
hey all,
How do you decide which codecs to allow in sip.conf? A typical
configuration looks like this:
disallow=all
allow=alaw
allow=ulaw
What happens when a call comes in that uses a different codec? Any
pointers to a good reference are welcome.
--
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Carla Schroder
Linux geek and random computer tamer
check out my Linux Cookbook!
http://www.oreilly.com/catalog/linuxckbk/
best book for sysadmins and power users
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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