AltiGen comm ACM 5.1 - Manual (Page 185)

Chapter 12: Trunk Configuration
AltiWare ACM 5.1 Administration Manual 171
Transmit to CO
(dB Gain) Slide setting adjusts the gain from the trunk to the CO from
0 dB to -7 dB for every Quantum Trunk channel.
The default setting is
0 dB , and it is highly recommended not
to change this setting.
Caution! Setting the volume too high will cause distortion in
voice quality and/or missed DTMF digits.
Parameter Description