The security system phone line needs to be wired in parallel to the connection to the modem and in between the distribution to the other phone jacks in the house. The security system needs to be able to cut off regular phone calls when it needs to call the monitoring company.
|--- Alarm System --- phone lines
---- line to house ---|
You could wire it like a regular phone but that means the system won't be able to call the monitoring company if someone is on the phone or if the phone is off the hook.
The other issue will be if there is a POTS splitter wired in to the line, which is common for Telus to use for copper connections. Whoever installs the phone jack will need to know how to deal with that.
This is a self monitored system. So I could put a splitter on the back of the T3200M and drop a line to the alarm box?
I would recommend against that. That could interfere with the modem's connection. There should be a POTS splitter somewhere wired in that isolates the modem from the rest of the phone jacks. It's usually near where the phone line comes into the house. if you had a splitter on the line to the rest of the phone jacks, that should work depending on which POTS splitter they installed. There are two types: