Look at all the phones I have in my office.  On the far right is that white Syspine Response Point base unit.  Just to the left is the Dlink version   I also have one white Syspine phone and a black Dlink phone.  On the left, just under the left monitor is my Office Communications phone.  If that's not enough, I also have a headset for click-to-call conversations using the internal company OCS network.  Oh, and that Treo on the right is my mobile phone.

Try it out:  you can call my Response Point phone anytime at: 425-881-2170.  If I'm not here (or if I'm too busy to answer), talk to the automated receptionist, or leave me a voice mail.