CX200 and CX300 are USB audio devices, so they can work with any 
softphone.
CX200 has echo cancellation build in, but audio quality is relatively poor 
because the echo cancellation is too strong.
I can't recommend the CX200 because of this.
CX300 has (almost) no echo cancellation, but audio quality is good. 
Sometimes when using the speakerphone the CX 300 can cause echo issues on 
the other side, 
if you then swap to the handset its not a problem anymore.
With a good software echo cancellation that should not be a problem at 
all.
The CX300 buttons can be mapped in Bria, so you can use the buttons as 
well.
I use the CX 300 in combination with Bria on a daily basis, for longer 
conversations I use a headset connected to the CX300, 
shorter conversations via speakerphone. It is easy to swap between the 
different modes (press of a button).

Paul

Tony Graziano <tgrazi...@myitdepartment.net> wrote on 22-01-2012 21:16:03:
> 
> the cx series does not work with sipx as far as i know.
> 
> On Sun, Jan 22, 2012 at 3:06 PM, Scott Howell 
> <scott.howel...@gmail.com> wrote:
> >
> > Content-Type: text/plain;
> >  charset="utf-8"
> > Content-Transfer-Encoding: 8bit
> > Organization: SipXecs Forum
> > In-Reply-To: 
> <CAMgKNJXU5AXd64Q87-4Pm6q=aixhsv6ocvxeu6owk4vbndf...@mail.gmail.com>
> > X-FUDforum: 08063afcdd00a6e76393c5b9527381e8 <65608>
> > Message-ID: <10048.4f1c6...@forum.sipfoundry.org>
> >
> >
> >
> > Is the "feel" of the USB phone comparable to a true
> > SoundPoint phone?  If so, what model are you using and what
> > SoftPhone client?  I have Bria and Jitsi for testing, but
> > just use a USB Headset.  I am considering laying out the
> > cash to just pick up a CX200 to test.  The Poly CX Series
> > are the only ones I have seen in the market that even look
> > like a traditional deskphone, everything else seems to just
> > look like a wired cellphone from 1990 :)
> >
> > I actually forgot about the possibility Estos, but there
> > again very expensive just to get basic CTI control.
> >
> > Has anyone used Camrivox?  I think I will go ahead and give
> > it a try tonight although this particular client doesn't
> > really need Outlook integration per se, but it gives all the
> > rest of the basic call handling required.
> > _______________________________________________
> > sipx-users mailing list
> > sipx-users@list.sipfoundry.org
> > List Archive: http://list.sipfoundry.org/archive/sipx-users/
> 
> 
> 
> -- 
> ======================
> Tony Graziano, Manager
> Telephone: 434.984.8430
> sip: tgrazi...@voice.myitdepartment.net
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> 
> Email: tgrazi...@myitdepartment.net
> 
> LAN/Telephony/Security and Control Systems Helpdesk:
> Telephone: 434.984.8426
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> 
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