Motorola S305 - Manual (Page 17)

6
If you receive a second call, the indicator light flashes green rapidly on your
headphones, and you hear an alert.
calls
Press — answer second call (first call is placed on hold),
end second call (first call resumes), or
resume first call on hold (when second caller hangs up)
Press( or ) — reject second incoming call
On most phones, if you end the second call using your phone or headphones, the
call on hold instantly resumes. If the other person ends the call, the original call
remains on hold until you resume the call, either by pressing the button on your
headphones or by using the phone to resume the call.