That looks like an old Ademco system. There will be a main panel somewhere, probably in a closet in a metal box that may or may not be locked. Typically near an outlet with a wall wart power supply.
Get the model numbers from the main panel and the keypad and you should be able to find manuals that will do into detail about all the possible features. These old units required a wired land line for reporting to work, so you might have to get creative for that.










Yeah, it’s just for remote monitoring. But if it’s not connected, it will probably always show communication errors on the panel above. Sometimes you can get away with using a telephone line emulator like a Magic Jack (sometimes not, it’s hit or miss).
I rented a place that had a slightly newer honeywell/ademco system (that was no longer in use) and was able to get it running locally with a Magic Jack. I programmed my cell as the monitoring company. So if it went off, I would get a call from that # and know it was an alarm. The downside to that was it keep calling over, and over, and over. Making it difficult for you to call the police (found that out the hard way).