Brother MFC-640CW - Manual (Page 86)

5 - 8 QUICK-DIAL NUMBERS AND DIALING OPTIONS
Answering calls with the Speaker Phone
When the machine rings, instead of lifting the handset, press
Speaker Phone . Speak clearly, toward the microphone . To end
the call, press Speaker Phone .
If you have a bad telephone line connection, the other party might
hear your voice echoed during the call. Hang up and try the call
again—OR—Pick up the handset.
Hold
1
Press Hold to put a call on Hold.
2
You can replace the handset without disconnecting the call.
3
Pick up the machine handset to release the call from Hold.
Picking up an extension handset will not release the call from
Hold.