I've had several customer ask not to have Music playing on their 3300. They prefer a beep tone.
This isn't native on the 3300 and I've never been able to find a recording on one.
So....
Yesterday I created one.
It's available for download. You can find them here: [edited] There are two. Different pitches.
Let me know if you have any issues with them.
Ralph
[Update Nov-25-13] I have moved the
Beep Tone for Mitel Music On Hold Here.