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U S I N G C A P T E L I N 2 - L I N E M O D E
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How 2-Line Mode Works
The voice conversation is carried on Line 1, just like with any other landline
telephone. When the receiver is lifted to make or receive a call, Line 2
automatically connects to the Captioning Service to provide the captions. You
can turn the captions on/off at any time during the call over Line 2, without
affecting the voice conversation on Line 1.