The company I worked for had the same kind of "hack" done to it a few years back. It seems that the receptionist had decided that 1234 was a good voice mail password and the "hacker" changed the outbound forwarding number to 011. Fortunately Bell Canada has a decent fraud department and only one weekend worth of calling went through the system with a $2,000 price tag.
I was called in to clean up the mess and all I could really do was just remove the relaying from everyone's mailboxes, then we got rid of that phone system completely and went with asterisk which has it's own set of challenges but careful log scrutiny.
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I was called in to clean up the mess and all I could really do was just remove the relaying from everyone's mailboxes, then we got rid of that phone system completely and went with asterisk which has it's own set of challenges but careful log scrutiny.