We use an Avaya IP office, that detects the MWI indicator that is being refreshed every 30 minutes from the ONT. We have voicemail, completely turned off on our Digital Voice service because we prefer to use our own voicemail. Problem is that even though it's all off - the ONT still does this refresh signal every 30 minutes at about 5 minutes past the hour, and the system thinks it's an incoming call.
Trying to explain this to support is brutal, but based on research, it actually CAN be turned off somewhere in the ONT to stop this refresh signal. How do I explain this in a service ticket? They don't seem to understand the issue.