Vertical Communications DSU II - Manual (Page 45)

· To mute your station,
1. PRESS
MUTE (mute function and light turn on). You can still
hear the distant party, but he or she cannot hear you.
· To speak to the distant party,
1. PRESS
MUTE again (mute function and light turn off).
Single Line Proprietary Telephone Station User’s Guide 39
GCA70-246 Other Advanced Features