I have never tried this personally but i would think if you did a supervised transfer to that phone and had no forewarding set on it...

i would try this dial string just as a test
xxx,,,,1 if you dial a 1 to a tone first DKT it then turns into voice first and vise versa

then i would try it as unsupervised. just in case you dont know, putting an H after the DN/user id makes it unsupervised so the string would be
xxxH,,,,1

Bert