Is there any way to restrict an extension to only be allowed to be dialed by a certain extension group or by internal only? I have 18 Snom PA1's - one at each of my buildings. There is currently no way I can find to prevent the world from paging in my stores. Or even a disgruntled or prankster employee at one store from paging over another's PA. I can't imaging this is NOT available, but if it's not, will a mod please move this to the ideas thread? Thanks.