MALUX ResistTel MB Operating Instructions Manual page 10

Connecting the headset (optional accessory)
Remove the sealing plug (6) and screw in the M20x1.5 cable gland
completely. Insert the cable with the headset socket (included in the
package of the FHF headset) through the cable gland and connect it
to clamps 5 to 10 (HSM+, HSM-, HSR+, HSR-, HSS1, HSS2)
according to the wiring plan. Only use the cable included in the
package of the headset, because the IP66 rating of the device
cannot be guaranteed.
Connecting the second headset (optional accessory)
Remove the sealing plug (6) and screw in the M20x1.5 cable gland
completely. Insert the wire of the second headset through the cable
gland and connect it to the clamps 7 and 8 (HSR+, HSR-) according
to the wiring plan.
Check the correct position of the cover seal prior to assembly. Connect
the ribbon cable with the connector (7) to the pin header (8) in the upper
part of the device. Mount the upper part of the phone and fasten it with
four cover screws (2) to the lower part of the phone.
When optional accessories are removed, close the openings created
with the appropriate sealing plugs.
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