Regaining access to Mitel 3300 Phone System

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?

Thank you
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OAC TechnologyProfessional NerdsAsked:
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pony10usConnect With a Mentor Commented:
Have you tried the serial connection?  

Set up a serial connection between the 3300 Configuration Tool
PC and the Maintenance (RS-232) port on the 3300 Controller.
Baud rate - 9600, Data bits - 8, Parity - None Stop bits - 1, Flow
control - None.

Here is the technicians handbook:   http://www.wedophones.com/Manuals/Mitel/Mitel%203300%20ICP%20Rel%203-2%20Handbook.pdf
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tjc123IT DirectorCommented:
Check your DHCP leases and see if you can identify it by the MAC address or host name?
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OAC TechnologyProfessional NerdsAuthor Commented:
If I connect via the console cable is there a way that I can change the security so that I can connect to the web interface through another IP address, or at least see what the IP address is that I need to use?

I already checked DNS and DHCP leases, but it was over a month ago that the computer was changed over, so there wasn't any luck there.
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pony10usCommented:
Is it possible there is an ACL in a router that is being used?

Here is Mitel Edocs site:  http://edocs.mitel.com/default.htm
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OAC TechnologyProfessional NerdsAuthor Commented:
No, this is all internal, there is no router between the computer and the Mitel system. Thanks for the site
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