Do I need a Zap Trunk if

I am realtivly new at * and i would like to recieve incoming phone calls from a Cisco 2600. I belive it has a fxs card in it because we can send calls from a sip phone to a pstn and vise versa. I used the snom proxy and that was able to recieve phone calls in. I have switched to * and now i can’t seem to make the calls come in?What hardware do i need and what kind of trunk would i need to setup? Currently i am using *@home. Looking for even some pointers would be great. Thanks

If the cisco Has a pots line connected to it I believe I would just get an Get a TDM400 card from digium with anf FXO port on it and bypass the Cisco