Since you have not ported, this doesn't really apply to your case.

For now, your outage number will continue to work. For internet forwarding you would enter your current VOIPo number@cherrio1.voipo.com but if you do this all calls to your current VT number will go straight to your VOIPo number. Your VT phone will not ring, but your VOIPo phone will, and the caller dialing your VT number will hear ringing/you/ VOIPo voicemail depending on your setup.