Place this clip at the moment a number is entered, before a confirmation cue like the bell ding sound effect in a menu sequence. Follow a failed entry with the classic error sound button to show the call did not go through.
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This clip is the short DTMF tone produced when pressing 9 on a phone keypad, lasting just over one second as a clean dual-frequency beep. It feels instantly familiar and oddly satisfying, bringing back landlines, old mobiles and automated menus. The tone comes from standard telephone dialing systems, where each number has its own paired frequencies.