----- Original Message ----- 
From: "Lonnie Abelbeck" <[EMAIL PROTECTED]>
To: "Discussion of AstLinux - Asterisk on Compact Flash"
<[EMAIL PROTECTED]>
Sent: Tuesday, February 28, 2006 8:16 AM
Subject: Re: [Astlinux-users] Possible for 50 SIP ConcurrentCalls?
Soekris/WASP

[...]
> I'm just saying with canreinvite=no, SIP vs IAX2, the Net4801 has more
> work to do trunking via IAX2 vs SIP.
>
> Maybe the CPU horsepower difference is very small, but combining all
> the voice streams into one stream, in a timely manner, doesn't seem
> like a small thing to me.

One is not forced to turn trunking on, and if that is done there are
significant bandwidth savings over SIP+RTP (see
http://www.asteriskguru.com/bandwidth_calculator.php , or the tables at
http://www.convergence.com.pk/iax2/trunked.html ).

> For VoIP service providers, IAX2 does not scale, but SIP can scale
> nicely.  Maybe there are lessons that apply to the embedded systems as
> well.
>
> My VoIP provider, teliax.com, has IAX in their name, but publicly admit
> that the voice quality is better if asterisk users trunk via SIP
> instead if IAX2.  Teliax's users agree with this recommendation, as
> much as we like IAX2.

Things should improve with the latest multithreaded code by Mark Spencer:

http://lists.digium.com/pipermail/asterisk-dev/2006-February/019002.html

I'm also curious to know if anybody has tried the IAX implementation in
Opal (http://www.voxgratia.org/docs/derek/ ). That was said to be less
timing-sensitive than the traditional libiax2 used in Asterisk until now.

Enzo

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