Matrix: How do I connect a Telos 1 interface to a Matrix +3 frame?
In order to connect a Telos 1 or Telos 1 + 1 telephone interface to a Matrix +3 system so that a POTs telephone service can be used to dial out from a user panel an FOR-22 can be used for audio isolation and it's associated onboard relay and logic inputs. A specific custom cable will need to be constructed to make use of the balanced audio input and output, logic input and relay contacts, see attachments below for cable diagram.