when I downloaded vonage talk, I lost my network availibilty number which was set to forward to my cell phone. and since you can only forward 1 number, this is stuck to forward to vonage talk. when I have my computer turned off, and someone tries to call they receive a message that says "the party you are trying to reach is not available at this time, please try again at a later time" even though I have my vonage line to forward to voice mail if not answered after 40 seconds.
since I lost my cable service, and I cannot use the vonage modem, I figured that at least I can make & receive calls from my PC and when I am not on my PC, the calls would forward to my voicemail.