[Asterisk-Users] Concurrents calls on asterisk with H323

[T. Chan]

I agree that it should be able to do more than 15 to 20 calls when NOT
transcoding, however, I WAS doing pass-through without any transcoding and
it was crashing after around 15 to 20 calls, that was the problem, while I
was expecting at least hundreds of simultaneous calls ( not channels ) doing
pass through, because this is what other softswitches are able to do very
reliably.

Also, I do not see WHY transcoding should not let us do more than 15-20
calls (in my case, only passing through), I read somewhere that one of our
associates here has experienced about 45 calls when transcoding. The
question becomes if this is all we can do with one server, what is the point
of getting 4 E1s Digium card while one can never be able to use 120 channels
transcoding from VOIP to TDM?

Can someone shed some light on this please? Thanks !

Tom

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of John Todd
Sent: Monday, January 19, 2004 11:30 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] Concurrents calls on asterisk with H323


>Look for the recent 'capacity testing' thread here. We've had some
>discussions on it, but so far the bottom line sounds like you won't
>be able to run more than 20 - 25 decent quality calls before
>asterisk dies.
>
>jesse
[snip]

Your statement relies completely on assumptions which may be
incorrect.  Transcoding significantly degrades performance, but
without transcoding it may be possible for * to move dozens or
hundreds of calls with H.323.  See note below.

JT




>Subject: RE: [Asterisk-Users] A question on codec translation.
>From: "Tom Lowe" <tom at comprotech.com>
>To: <asterisk-users at lists.digium.com>
>Reply-To: asterisk-users at lists.digium.com
>Date: Mon, 12 Jan 2004 08:45:21 -0500
>
>If the incoming and outgoing Codecs are the same, there is no
>"conversion" done.  It basically becomes a packet relay, what goes in,
>comes out.
>
>I'm not sure of the answer to your second question.  However, your
>question actually begs a question I've been wondering about in the last
>couple of days:
>
>I'm doing H.323 in, H.323 out....simple relay.  (This is my customer's
>requirement...not my preference).  What I want to do is ALWAYS use the
>same codec for the outgoing leg as for the incoming leg.  In other
>words, if the call comes in as G.729, the outgoing call uses G.729 ONLY.
>If the incoming call is G.711, I want the outgoing to be G.711.   I want
>to avoid any sort of transcoding.
>
>Is it possible?
>
>Thanks.
>
>Tom Lowe
>
>(FYI, Dual Xeon 3.06, 120 channels (60 calls) of above scenario, G.729
>using less than 10% CPU!)  (Remember, no transcoding is being performed)
>


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