I have a customer who was locked out all their VM boxes the system admin password was also changed. last week i went on site. I used the back door password to gain access reset every ones MB passwords all was good. Today I get a call saying its happened again. Also, the customer got a call from an individual at home who said they got a call from someone claiming to be master card but the caller id name didn't match. (The individual called them back by looking up the company name from their caller ID)
I'm thinking someone has hacked their voicemail and is using it to make calls on their lines. I guess the way to stop this is to restrict CO line access to the voicemail ports But that wont keep the hackers from messing up the VM Is their a setting in the PVM (full sized card) to turn off the ability for remote log in?