Well, most service observing units will monitor analog lines, such as the POTS lines that connect to your system, or Single Line phones. You could set up remote access, with a barrier code, dial in, transfer yourself to the service observing unit, and then monitor lines or stations.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.