Uploaded March 2026 | Updated September 2026, 1 hour ago
Real Gen X hacker/cracker tales from the Netherlands in the 80s & 90s.
Today I will explain how we hacked phone answering machines with remote access capabilities in the early 90s. What the default passwords were and how I wrote a brute force hacking password using Hayes Voice commands to bruteforce pin codes by sending voice dtmf commands.
Code: github.com/rdoetjes/tuts/tree/main/answering-machine-bruteforce
Chapters:
00:00 Intro
00:12 Explaining Remote Access on answering machines
00:39 Jelle asked me to get school's answering machine details
01:11 I used social engineering to get the details of the school's machine
01:53 Jelle gave me the details to gain remote access
02:26 Jelle told me this machine allowed to change the outgoing message
02:53 I was determined to change the message
03:00 This is the dirty message I put on to that machine
04:09 Default passwords and brute force method
04:53 Requirements for a brute force attack
05:50 We had a successful brute force attack
06:10 Jump into the code
06:58 Explain the Hayes commands
09:07 Hardware requirements
09:35 Why I can't run a demo with actual modem
10:01 Building a loopback adapter for testing the serial
11:09 Testing serial with loopback
12:09 Explaining the code
15:24 Some shocking answering messages I remember
16:05 Be careful what you share and store on devices
Real Gen X hacker/cracker tales from the Netherlands in the 80s & 90s.
Today I will explain how we hacked phone answering machines with remote access capabilities in the early 90s. What the default passwords were and how I wrote a brute force hacking password using Hayes Voice commands to bruteforce pin codes by sending voice dtmf commands.
Code: github.com/rdoetjes/tuts/tree/main/answering-machine-bruteforce
Chapters:
00:00 Intro
00:12 Explaining Remote Access on answering machines
00:39 Jelle asked me to get school's answering machine details
01:11 I used social engineering to get the details of the school's machine
01:53 Jelle gave me the details to gain remote access
02:26 Jelle told me this machine allowed to change the outgoing message
02:53 I was determined to change the message
03:00 This is the dirty message I put on to that machine
04:09 Default passwords and brute force method
04:53 Requirements for a brute force attack
05:50 We had a successful brute force attack
06:10 Jump into the code
06:58 Explain the Hayes commands
09:07 Hardware requirements
09:35 Why I can't run a demo with actual modem
10:01 Building a loopback adapter for testing the serial
11:09 Testing serial with loopback
12:09 Explaining the code
15:24 Some shocking answering messages I remember
16:05 Be careful what you share and store on devices
