Motorola H520 Quick Start Manual page 12

TO...
calls
answer call
mute or unmute a call
reject call
end a call
redial last call
make a voice dial call
answer or reject
second incoming call
calls
Press the Call button.
Press both Volume buttons.
Press and hold a Volume button until you
hear a tone.
Press the Call button.
Press and hold the Call button until you
hear two tones.
Press the Call button and wait for voice
prompt.
Use phone to answer/reject second call
(follow your phone's instructions)