Simple Project for Asterisk Guru
1- Place a call to Asterisk (sip local number), detect my clid and Hang UP.
2- Detect to know is a valid clid (look a the mysql database for find user with that clid)
3- Call Back that number with a dialtone and the user enter a phone number
4- Verification in the DB; that phone numbers is Ok to dial
5- If is OK ; Make the call
Web Page in PHP for insert informations for the application