[Freeswitch-users] incoming pstn to multiple sip extensions?

I want to route incoming pstn calls so that each call rings all SIP extensions (in a given list). Whoever answers gets the call. How do I configure this? I also want to route all incoming SIP calls to ring all SIP extensions. How is it done? Alternatively, it could work like a key system where any SIP extension can pick up the "line" and access the call.