Which country are you in?
Check the info from the great guys at:
Hope this helps, please rate post if it does!
Tone-based disconnect supervision is not very reliable and sometime doesn't work at all.
However in the debug seems like you're getting battery reversal, try that:
It's probably 425 Hz after all. The recording you sent has a lot of noise and the frequency analysis can be impacted. The main problem is that tone-based is unreliable in itself.
That "might" be CSCek27376. Do you use "connection plar XXX" or "connection plar opx XXX", and can you switch to the second if using the first ?