Aastra SIP 53I Administrator's Manual page 628

IP Phone Administrator Guide
Operational, Basic, and Advanced Parameters
Parameter –
handset tx gain
Description
Format
Default Value
Range
Example
Parameter –
handset sidetone gain
Description
Format
Default Value
Range
Example
A-126
Configuration Files
This is the increased (+db) or decreased (-db) amount of signal
transmitted from the handset microphone to the far-end party. The amount
of Tx gain in the IP phone firmware has been reduced to avoid side-tone
and echo on the local and far-end equipment. This parameter allows you
to adjust the Tx gain settings to best suit your comfort level and
deployment environment.
Integer
0
-10 db to +10 db
handset tx gain: -5
Configuration Files
This is the increased (+db) or decreased (-db) amount of sidetone signal
from the handset microphone to the handset speaker. The amount of
sidetone gain in the IP phone firmware has been reduced to avoid
side-tone and echo on the local and far-end equipment. This parameter
allows you to adjust the sidetone gain settings to best suit your comfort
level and deployment environment.
Integer
0
-10 db to +10 db
handset sidetone gain: -1
aastra.cfg, <mac>.cfg
aastra.cfg, <mac>.cfg
41-001160-00, Release 2.1, Rev 04