This guide covers modifications that need to be made so an LE Series substation can be added to an existing MP-S answering station.
Note: Stainless steel LE Series stations such as the LE-SSR, LE-SS/A, and LE-SS-1G do not require this mod.
Using an LE Door or Sub Station with an MP-S Answering Station
AP-M Operation and Installation Instructions
MP-S Instructions
Adding External Signaling to an AP-M Answering Station
Adding an LE Series Door or Sub Station to an AP-M Answering Station
Using an LE Door or Sub Station with an MP-S Answering Station
Adding External Signaling to an Existing MP-S Answering Station