My old VOIP service had this (I know they had one of these for sure)....

1) Call Forward On Busy/No Answer. If the VOIPo phone rings more than 5 - 6 times with no answer, or if the line is busy, please allow the call to be forwarded to an alternate number.

Simul-ring doesn't fill the bill here because then both lines would ring simultaneously. I don't know what happens if someone is on the phone with Simul-ring (does the caller get a busy, or does the other phone ring anyway?)

The idea here is that if someone dials my home number but no one is home, or if the line is busy, the call would instead be picked up by my answering service.

2) True Find-Me service. You'd be able to specify a list of phone numbers (up to three), along with ring times in seconds. If someone calls the VOIPo number and no one answers, after 30 seconds it would dial the first number on my list. f no one answers that number after, say, 25 seconds, it would dial the second number on my list. It could be used for virtual numbers and real numbers (one number could have a Find-me list, while another does not (perhaps it would be a busy/no answer number instead).

I get the feeling this has been suggested before, but I couldn't find anything recent on this,

Shawn