[asterisk-users] Help with concurrent VoIP calls

[Tom Moore]

If you've got a bellsouth dsl connection because of the way their system
works even with doing qos on the link you can really only do about 8 calls
before you start to run into problems with their setup.

Tom
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of John Timms
Sent: Saturday, November 07, 2009 2:45 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Help with concurrent VoIP calls

Hi. I'm having trouble figuring out why I'm not able to make many concurrent
VoIP calls on my system. I'm not aiming for a huge number, because I have
purposely bought a low powered system, but I would think that I could get
more. Here are the details:

I have a small-form-factor Asterisk server with an Intel Atom 230 CPU
(1.6 GHz, 533 MHz FSB) and 512 MB DDR2 533. It is running Ubuntu Server 9.04
with the default Debian package manager installation of Asterisk. (version
1.4)

Here is what is going on: I'm making outgoing calls (with .call files) via
SIP (using Vitelity's service, if anyone wants to know) with about 55.0 ms
latency between my Bellsouth DSL connection & their servers.
I'm using GSM-format prompts with GSM encoding (disallow=all, allow=gsm in
sip.conf) and I'm able to make about 7 concurrent calls.
I have a very fast internet connection, so there is still plenty of
bandwidth, and the "top" command shows that Asterisk is only at about 5% CPU
and 10% RAM. Even with only 7 calls, a landline phone will "skip"
occcasionally, but cell phones have perfect quality.

I don't think that 7 calls is very many, I'll be happy if I can get 10
good-sounding calls. Can anyone give suggestions? (If this has been hashed
out elsewhere, I'm happy with a link to more information!)

Thanks.

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