[Freeswitch-users] VMWare voice quality

Darren Schreiber d at d-man.org
Thu Jan 15 09:46:32 PST 2009

I have been running FreeSWITCH on a VM ever since I got involved in the
project. It's been almost a year now. I didn't do anything special - it
works fine. I get audio problems if I go over 10 or 15 simultaneous calls.
This is on the following setup:

VMWare Server 1.0.6 and VMWare Server 2.0 (2.0 sucks, btw </rant>)
Dell Precision 360 (Desktop)
Pentium 4 2.66Ghz
2.5GB RAM (512MB allocated to FS)
Fedora Core 8, stock kernel (a bit old)
7.2K 80GB hard drive

Yes, fancy machine I have, huh?

This is my normal day-to-day workstation as well as my VMWare Server. It
works fine, I got occassional missed heartbeat alerts and timer sync
notices, but they're rare.

- Darren


-----Original Message-----
From: Michael Collins [mailto:msc at freeswitch.org] 
Sent: Thursday, January 15, 2009 9:32 AM
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] VMWare voice quality

If anyone figures this out please post it to this thread. I am working on a
wiki page for the VMWare appliance and I would like to be able to inform
people on how to handle this situation.

Also, IIUC, those running VMWare Fusion on Macs are not experiencing this,
correct? What about those using a hypervisor like ESXi? Any known issues?


On Thu, Jan 15, 2009 at 9:15 AM, Ken Rice <krice at suspicious.org> wrote:
> On 1/15/09 11:01 AM, "Remko Kloosterman" <R.Kloosterman at mtel.nl> wrote:
>> Hello Ken, hello all,
>> I just read about the FreeSWITCH VMware applicance. I'm curious about 
>> your experiences with the audio quality on VMWare, so here's a new 
>> thread.
>> I've installed freeswitch on VMware Server for Windows. The IVR audio 
>> always plays choppy, while the server itself has no performance issues.
>> The same poor voice quality also goes for Asterisk or Yate, even on a 
>> very fast VMware ESX system.
>> Did you experience the same and/or do you have pointers on how to 
>> troubleshoot and fix this?
> There is a high resolution timer you need to enable on vmware... I'm 
> not familiar enuff with all the versions of vmware to advise there 
> that switch is, but they have a couple of articles on it in their 
> knowledge base
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