Happy to say that I keep Simul Ring always on pointing to my cell phone and have not had any problems..

This thread however, prompted me to post about an unusual thing I noticed today.

Since my cell rings along with the main number, I can always see where the call is coming from. Today and yesterday for the first time, I noticed that one particular call came in with the name on the main line as 'unavailable', but on the cell with the full name. Since the call first hits VOIPo and then Simul Rings it to my cell, what makes the difference?