How install Door Intercom circuit board with HAI circuit board?

pacasey

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Adding a door intercom (Channel Vision TE-111), where when someone rings the front door bell all the house phone ring with a distinctive ring.
Have a HAI OmniPro II and not sure which of the following below is the correct spot to splice it in?
Do I place the TE-111 before, after, or in parallel with the HAI circuit board?
What I have now: Line in from street ---- to HAI ---- to house phones
Option 1: Line in from street ---- TE-111 (line) / TE-111(Tel) ----- to HAI ----- to house phones
Option 2: Line in from street ---- to HAI ----- TE-111 (line) / TE-111(Tel) ----- to house phones
Option 3: Line in from street ---- splice into two (2 Line in wires): with one to the HAI, and one to the TE-111 (line) ----- take the line coming out of the HAI, and the one out of the TE-111(phone) and splice them back into one wire ----- to house phones
Thanks!
 
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