Uniden UIP312 ユーザーズマニュアル

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6.2 How to Use the Headset and Headset Adapter
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Insert the Headset Adapter into the SPK and MIC holes on the left side of the phone
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Insert the RJ-11(4-Pin) headset  jack from headset into the Headset Adapter.
RJ-11 4P
Speaker
MIC
Note: You can use any standard headset since UIP312’s headset pin map conforms to the
standard.
When using RJ-11 Adapter, use a headset with the pin map following the order
[MIC+, Speaker, Speaker, MIC-].
For maximum voice quality when using the headset, the following headsets are  
recommended. 
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Plantronics TriStar H81, GN Netcom Headset
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