your phone shouldnt be doing that. I have the same phone, and when phoco disconnects, i push the button on my headset and it connects to my phone and I talk. When im done with the call, the hedset drops the connection and PhoCo pics it back up automaticly
If you are having pairing issues, im not sure whats going on with your set up.
what bt dongle do you have and what headset are you using?