How does someone do this these days for spam calls?
You can just program your VOIP system to use ANY phone number for caller id. The VOIP system in my corporation can even do this PER EXTENSION and update each second if you write a simple script to interface with the web interface. Most phone systems even support additional character transmission like I could call you from my VOIP and it would say 800-288-4727 x 2600 (or anything I desire!)
There is literally no security to it at all
Basically the caller ID info is transmitted between the 1st and 2nd ring. If further caller ID data is transmitted after (like the real data), it is ignored
If your data gets to the receiver first, it gets displayed
It’s been possible to “spoof” caller id since forever, and there were open descriptions of the process and methods of generating that data and transmitting it since at least 1998. I can recall a popular electronics article on this with circuit layout.
This is probably similar and would require flashing the chip with the included .asm file… https://www.elektronika.ba/385/caller-id-and-ring-generator/
Click the red download button, I’m not able to grab the zip file link directly from my iPhone but it does download and show the circuit diagram
Someone here would have the skills to closer examine the .asm if they were well versed in atmel chips , specifically AT90S1200
This would be for use with an old fashioned POTS phone line. But hey this is hacker news I thought someone might be interested in the analog option :)
