TANDBERG MXP 550 - Manual (Page 41)

General Use
33
3.5.4 Using Hold and Resume
Only one call can be active at any given time; all other calls must be placed on hold.
Action
Procedure
Put a call on hold:
Highlight the call you want to put on hold and press the
Hold softkey.
Remove a call from hold:
Highlight the call you want to remove from hold and press
the Resume softkey.