We have a Mitel 3300 phone system that the previous IT person locked down so that the server could only be accessed via a single internal IP address. The computer that was able to access that system (the desktop computer was set with a static IP) was changed over to DHCP about a month ago and no one wrote down the previous static IP address that was set on that computer. So unfortunately now we need access to the Mitel 3300 and we are unable to get in because we don't know what IP address that system was locked down to.
What is the best way of gaining access to this system? Is there some sort of console access where we can make changes to the allowed IP addresses that connect to that system's management interface?