[Freeswitch-users] Operator features

Hello Everybody! i need to have the possibility of sip termination status checking (available, busy etc) from a central voip hardware phone (i read that it is possible with SNOM), and i need also the possibility to pick a call directed to another extension pressing the relative button. Can someone explain me how to configure freeswitch and suggest me a phone? Thanks in advice :) Gabriele