I am having problems getting the facility 'station lock' to work or maybe I misunderstanding its use. The intention is to use this facility to prohibit other people from using a phone not for their use. I enetr the feature access code for this faiclity followed by the ext, then #,the security code, then #. I get an acceptance tone but I'm still able to make international calls? if anyone can give pointers I'd appreciate it.