# of rings - or ring the analog phone?

How can I define the number of rings before my AAH server will pick up an incoming call? I would like calls to be routed to the analog phone connected to my xp100 card if possible - could I just set up a ring group or seperate extension and have the calls routed as such if the caller dials an option?

i.e., if you want to reach the operator dial “0” - and have that ring my analog phone connected to the card instead of using SIP?

otherwise I would want Asterisk to wait 3-4 rings before picking up, thereby allowing me to pick up the analog phone when a call comes in before the digital receptionist picks up. any thoughts?