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Rolm Phone - Behind these slits behind the handset cradle is the speaker phone speaker.  Volume on this speaker can be adjusted by pressing the volume up and volume down buttons ...
Volume Up...Volume Down.
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When using the speaker phone ... note that room and background noise can drowned out the speaker speaking through your speaker.  To avoid this cutting out effect ... press the ...
Mute... button while the other end is speaking.
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Phone User Guide   |   Siemens Rolm Phone User Guide