[Asterisk-Dev] Re: New h.323 channel driver

[Craig Southeren]

On Thu, 12 May 2005 15:41:29 +0600
"Paul Cadach" <paul at odt.east.telecom.kz> wrote:

> Hello,
> 
> George K. Konstantoulakis wrote:
> > Though it is true that you can use  OpenH323 without any problem
> > for a number of channels around 100+, there is probably a race
> > condition somewhere. On the same machine (IBM 336 2x3GHZ,  4GB RAM)
> > we can get 200 simultaneous channels with chan_oh323 but when using
> > SIP we get 1400+ (both without transcoding) .
> 
> Do not equate chan_oh323 and OpenH323, and don't compare H.323 protocol campain
> with SIP. H.323 requires much more CPU, file descriptors and threads than SIP.

I'd like to clarify this.

There is no theoretical reason why an implementation of the H.323
protocol should use any more CPU, file descriptors and threads than an
implementation of SIP doing the same job. The protocols are roughly the
same order of complexity and should require roughly the same resources.

However, I fully agree that most SIP implementations will use less CPU,
file descriptors and threads than OpenH323 will use for roughly the same
task. OpenH323 was developed with reliability, portability, ease of
maintenance, and the ability to add new features as it's is prime design
motivations.

Efficiency in a high density call environment has always taken a back
seat to these requirements. Which is not to say that these problems
could not be fixed, given sufficient motivation. And I have many ideas
about how this could be done, which I intend to apply as I am able.

   Craig

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