I'm probable being very stupid but despite trawling the forum and looking though the PDF manual I can't see how to enter tones during a call. EG for menu options. Hitting "Menu" during a call severs the call (is it supposed to do this?). There is a grid icon on the bottm of the screen which I thought was the one I wanted. But when its pressed al you get is:- flummoxed now. Any help would be appreciated.