Hi Skarr,
I don't think the solid state relay would work in this type of situation. However some new devices called MOS relays have been seen in alarm communicator designs for a few years now.
I took the time to draw out the circuit you posted along with the relays you would need in your interface. It is attached to this post.
I am currently looking at actually building a receiver first using regular alarm dialers. If I'm still up to it then I will progress to my own dialer. The dialers that I have been using the past 8 years have only cost me between $50 to $75 and I can program them and remotely access with my laptop but the receiver seems more interesting now. I own a few professional receivers that cost over $10K and they can receive multiple types of alarm communications but I will focus on one type that uses DTMF tones.
Will be out here if needed.
BobK
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