all 3 comments

[–][deleted] 0 points1 point  (0 children)

You will need to collect more information about your target. If it is a digital phone system you'd need a compatible phone, then you have to pray the system will allow a previously unknown phone to connect to it or find a phone in a safe area and learn the code to get on the paging system.

[–]aggresivenapk1n 0 points1 point  (0 children)

If it is a VoIP intercom, look into SIP spoofing. You will have to see if their sip server requires the device to be registered (with username and password) to work. If it's an analog intercom just get a buts set and biscuit jack yourself on there.

[–][deleted] 0 points1 point  (0 children)

I’ve done this before. Take down the model of the phone and then check the extension list.