Quote Originally Posted by TomP View Post
There is no stutter tone when all messages are deleted and the MWI light is still on.

This statement is key--if you don't have stutter tone, your ATA has received the MWI off signal. Since the MWI light is still on, it's clear that the ATA is not sending a signal that your phone always understands to turn the MWI light off.

I should have been a little more clear in my instructions--you want the voipo phone on hook when adding/removing voicemail from your line. Given your statement above, though, I don't think you need to repeat the test. For those whose phones don't reset themselves, the (obviously less-than-perfect) solution is to manually reset the indicator on your phone after you retrieve voicemail. On the Uniden phones, that's done by holding down the "Find Handset" key until the phones stop beeping (5-10 seconds).