I am new here, but I totally agree with Juse for the most part. It is already a secutiry risk for anyone to know those backdoor passwords.
I also had the same issue once and had to basically do what you guys are talking about, which I found very disturbing that i could not simply reset my own equipment back to some factory default.
At first I thought it was just the equipment provider being an ass and just wanting more money, but as I searched around the internet, I found that it seems to be the case with most out of date phone systems.
Most of the updated, VOIP systems we have been using do not have this issue and we can basically change whatever we want when we want.
Juse, I also had to write a program once to hack our phone system. Let me know and I can send you the code to help you get started. We basically just used a voicecard and dialed into the system like you normally would using a telephone and brute forced all the combinations since there was only 10,000 it took no time at all to send across the DTMF tones and crack it.
Whats funny is, I had to crack the encryption for our IP Office as well for the management software. That was the most basic encrytion I had ever seen and could not believe Avaya put it right in the files, lol!
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Just thought I would sharesome extra thoughts becausee I know first hand how frustrating it can be dealing with phone vendors/installers.