*99 on an RT32P2

[energyx]

Google search of: rt31p2 pdf
got me the zipped manual, link looked like an eye chart!

No sign of *99
Perhaps all invalid codes say "Thank you"?

I found the same thing. I've seen other services use *99 for clearing the voicemail indicator, so maybe that's all it does. It looks like my audio breakups are being caused by the device. I am seeing ping times to the device go from <1ms to over 400ms every 7-8 seconds... that would correlate with the timing of my audio issues. Now I just have to figure out if it's the switch port, patch cable or the device itself.