We Have a customer with a Merlin messenger v4.
Over the week-end something happened and now no one can access the v-mail system. Dialing in gives a
"buzy" tone. The system has been re-booted and the card removed and reseated, Giving the same result.
The card has a single red light displayed after boot up, I don't remember if this unit displays anything else if it's happy ... been about 4 years since we've had to do anything with it. any trouble shooting tips would be appreciated.

Thanks, Jeb