I have seen this request on here before, it's not that hard to do. Being that I am disabled, I always go for the easy store bought solution. I have been using two parallel consoles for several years with no problem. I am assuming that you want the second console in your bedroom so you can see what zones have alarmed without coming out of the bedroom to see a centrally placed console. In my home, I have to place the main console close enough to the doors we enter and exit through so I can hear the system arm/disarm. My home is also large enough that if I place a single console in our bedroom at one end of the house, it does not always work well with sensors at the other end of the house. With a centrally placed unit, if you have an alarm, you can't see what zone indicator is flashing without coming out of your bedroom, which may lead you into a conflict with whoever setoff the alarm in the first place. I wanted to see what zone was breached without having to leave my bedroom, so hears what I did.
Go to Radio Shack and buy a DC to AC inverter, the one I use is 75watts maximum, then buy a wall transformer that has a 120 volt input, and 12 volt output that will accommodate the load of the console. I use a 12 watt transformer and it handles the load of the console fine.
What happens is the windings of the transformer and the inverter filter out the signal line carrier coming out of the console,(in plain English, it keeps the consoles from seeing each other and blocks the signals from the console that is receiving power through the inverter setup to the sirens.
This allows you to setup a console in the center of the house that will be used as the main unit, and the second console can be setup in your bedroom with the inverter. Set both to the same house code, then place both units in program mode and add all your sensors. When finished, if an alarm is triggered in say, the basement backdoor zone 12, the console in your bedroom will alarm and indicate zone 12 breach and you don't have to come out of the bedroom to the centrally placed unit to know where the breach took place. You do not need to connect the console in the bedroom to a telephone wire or record a message, this console is only used to see what zone is flashing during a security breach.
If you need a second console because you do not have enough zones, that's another discussion.