1. During an active call press the key.
The active call is now placed on “Hold”.
2. Returning to a call on hold:
a) On KX-UT113 / KX-UT123:
Press the key again. The call is now active again.
b) On KX-UT133 / KX-UT136:
Press the flashing green function key at the right side of the telephone.