LG KS20 Operating Instructions Manual page 69

Voice Call Headset Mode Path & Head video Telephony Mode
MSM7200
(U100-1)
Voice Call Headset Mode is routed as below
MSM7200 HPH_L, HPH_R -> 18Pin MMI -> Headset
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Only for training and service purposes
Headset
AMP
(U402)
AMP
(U401)
Voice
Voice + MP3 + MIDI
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3. TECHNICAL BRIEF
Head_Set
Analog
switch
(U400)
Receiver and
Loud Speaker
MIC
Head_set MIC
LGE Internal Use Only