DSC HS2128 Reference Manual page 245

Telephone Line Wiring
Wire the telephone connection terminals (TIP, Ring, T-1, R-1) to an
RJ-31x Connector as indicated.
For connection of multiple devices to the phone line, wire in the
sequence shown.
Telephone format is programmed in section [350].
Telephone Call Directions are programmed in section [311] - [318].
Note: For ULC installations, please refer to the ULC Installation Information Sheet part#29002157.
Appendix 6: Wiring Diagrams
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