I own several laptops and computers, dedicated to business. 3 of them are Toshiba S-300's with serial ports. One has WIN-XP with BCM Element Manager, Panasonic, and NEC software, along with PuTTY and Portable Apps.
Your original request was that you were hacked and wanted to control the TVA voice mail system. That software is a Panasonic general distribution item. The Unified Maintenance console software is not.
One of our members, Ed Vaughn, is in NC and Panasonic smart. You might PM him and ask what he would charge to help you out. Outside of that, I have a policy of not posting specific answers that can end up in Google land forever. Been there, done that, got the T-shirt, and gave it to Goodwill.
Try reaching out to Ed, or perhaps someone else will help you. A "call your dealer" seems appropriate.
