I'm using Asterisk 184.108.40.206 under SARK/SME for my PBX. I'm am interested in setting up a script that checks for caller id and if it doesn't exsist ask the caller to enter a phone number. Can anyone help me with this? I am new to asterisk and don't know where to start. I was pointed in the direction of this website and was told this was the best spot to start.