Welltech LP-388 Oct-12-2007 - Manual (Page 73)

LAN Phone 388 User’s Manual 72
(2) Voice
Ring Volume: Adjust the volume of Ringer.
DTMF Volume: Adjust the volume of DTMF., Receive (Local side
hearing), transmit (remote side hearing), DTMF.
Echo Cancelor : Supports G.168/G.165.
Handset/Headset/Handfree Volume: Adjust receive voice
volume.
(User can press <-, +> button to adjust receive voice volume,
under conversation.)
Handset/headset/Handfree input: Adjust transmit voice volume
(If the other side hears echo, you must low
handset/headset/handfree input value.)