Yes, that is exactly what we do at work. We have ~20 IP phones in the office plus a few in remote locations. A few of us also use softphones (X-Lite or Zoiper)

Yes, that is exactly what we do at work. We have ~20 IP phones in the office plus a few in remote locations. A few of us also use softphones (X-Lite or Zoiper) & USB headsets. Our pbx is hosted by http://sipworxx.com/ http://sipworxx.com/ and it works great.