http://blog.vpetkov.net/2011/07/10/spoofing-caller-id-on-the-fly-from-any-phone-for-legal-and-legitimate-purposes/ Asterisk dial plan exert that allows to enter callerid before making a call
http://blog.vpetkov.net/2011/07/10/spoofing-caller-id-on-the-fly-from-any-phone-for-legal-and-legitimate-purposes/ Asterisk dial plan exert that allows to enter callerid before making a call
http://blog.vpetkov.net/2011/07/10/spoofing-caller-id-on-the-fly-from-any-phone-for-legal-and-legitimate-purposes/ Asterisk dial plan exert that allows to enter callerid before making a call