The beeping when someone is on hold comes from the main control box, not from the phone itself. You must be able to enter the Panasonic system's programming mode from a display phone connected to Jack 1 which is usually extension 101 in both the older 624 system and the newer 824 system. The Programming Code is "111" and this is covered in the KX-TA824 "Programming Manual" Version 3.0 on page 27. The two choices are "External" and "Tone," and you want "External" which deactivates the beeping tone and activates the miniature (3.5mm) phone jack on the control box for incoming audio (Music on Hold: "MOH"). By selecting "External," hold will be silent (no beeps) unless you connect an audio source to the jack. Entering the programming mode is covered on Page 15.
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