Installation manual

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The MLS series phones were introduced with the Partner originally. Each
system phone has an analog voice path and a digital signaling path. Phone
wiring requires only 2-pairs, unlike the Merlin phones.
Partner phones use an 8-pin modular jack, but work correctly with traditional
4-wire, 6-pin modular cords.
All system phones have an Adjunct jack that supports a standard “tip-ring”
telephone or phone accessory. Only a single pair is used.
MLS phones were built using a flexible membrane that has button contacts.
Over time, the membranes can corrode and fail; repairs are possible. See
more in section 7, “Maintenance.”
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