[Freeswitch-users] how to Block inbound(internal) sofia profile calls ?(don't allow for internal calls)

hi guys, i have defined two extensions named:1000 & 1001 so i am going to allow the above extension make outbound calls and disable inbount calls in other hand i dont want the ext:1000 able to make call to ext:1001 , and want to disable calling internal registerations sip  how can i do that? thanks so much