www.bt.com/help/userguides
Cordless 'phones without answering machine
Pane 5 - BT Synergy1000 User Guide pdf 43 pages...
Page 15 shows two buttons on the side of the 'phone on the left of the earpiece - the text says...
Press the VOLUME buttons + or – on the side
of the handset to increase or decrease the
volume. Display shows the level by a series of
vertical bars. I = min. I I I I I = max.
Peccavi, May 2009