HP 600 - Manual (Page 54)

46 Feature reference
Loudspeaker
Loudspeaker
You do not need to pick up the handset to make a phone call. When dialing,
just press the Loudspeaker button and enter the numbers. When your party
answers, pick up the handset to talk to them. This feature is especially useful for
checking voicemail messages.
NOTE: Your HP Fax does not have speakerphone capabilities. The loudspeaker
enables you to hear calls but you must speak using the handset.
TIP: If you want to share the conversation with somebody beside you, pick up
the handset and press Loudspeaker. The line is still connected and everybody
can listen to the conversation.
While you are using Loudspeaker, do not place the handset beside the speaker,
as this may result in noise interference.
Redial a number in memory
These steps allow you to dial one of the last 10 numbers called that is in
memory.
1. Hold Redial/Pause for about two seconds.
2. Press
 until Recent Numbers displays and press OK.
3. Press  to find the number you want to dial.
4. Press Start when the correct number appears.
If a document is loaded, the machine automatically begins to send.