When you virtualize phone systems it is very common to use an external media 
gateway for POTS access.

In the Cisco world, you would use a 28xx or 29xx router with some combination 
of T1, FXO, and FXS cards as a voice gateway.

They are not the only vendor of such things either.

-- 

Phil Brutsche
p...@optimumdata.com

-----Original Message-----
From: Ben Scott [mailto:mailvor...@gmail.com] 
Sent: Tuesday, November 08, 2011 8:52 AM
To: NT System Admin Issues
Subject: Re: OT - Phone System In A Virtual Machine

On Tue, Nov 8, 2011 at 8:56 AM, James Kerr <cluster...@gmail.com> wrote:
> I have a desire to run a voice-mail and PBX on virtual machines, if possible.

  If the phone system requires any special hardware in the PC, it's unlikely to 
work.  For example, expansion cards for interface to analog or TDM ports.

  For something that's just an Internet Protocol node, it should work.
  expect vendor support will be the biggest issue.  Phone equipment makers 
often act[1] rather ignorant when it comes to their PC-based platforms.  You 
don't want to end up in a "We don't support that configuration" scenario if 
your phones are down.

  From a technical standpoint, it should be fine.  OSes are already 
time-sliced; you're just time-slicing the OS now, too.  There may be some tech 
details to work through.  Real-time voice is very susceptible to latency and 
jitter, so there may be some VM tuning involved there.  You prolly don't want 
to oversubscribe the host resources for that VM.

-- Ben

[1] "Act", not necessarily "are"

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