AT&T Merlin Legend MLX-10 User Manual page 19

Your MLX-10 Telephone
Hold
NOTE:
Depending on how your system is set up, Transfer, Conf,
Drop, and Hold may not work exactly as described here.
If you have any questions about using these features,
contact your system manager.
1-6 Dedicated Feature Buttons
Press to put a call or conference on hold.
The green light next to the line button with the
call on hold flashes until the call is resumed or
the person hangs up. As a reminder, the
phone beeps once every 60 seconds. More
than one call at a time can be put on hold.
Press the line button with the flashing green
light to return to the call.