it is my residence- new in 1999

Lucent Partner phone system with 3 lines

but several jacks are provided (ahead of the Partner system) for DSS stb's etc

I have an Apex Destiny 6100 burglar/fire system which is disconnected (unplugged phone jack/power/battery) for several months: but now that I look the supervisory loop is still connected: could it still be dialing without power?