Did you ever wish you can conference phone calls with deskphone and a cell phone at the same time? You can If you have a Plantronics Savi 700 series wireless headset. All you have to do is press two buttons (desk phone & cell phone button) on the Savi wireless headset base, you now have a 3-way conference call. You can also do the same if you have a computer VOIP call (like Skype). You can pick any of the 2 sources (computer, cell phone, or desk phone) and have a party-line or 3-way conference call. It doesn’t work with all three.