Welltech FXS SIP Gateway V.2.9 - Manual (Page 57)

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FXS Gateway Overview
LABEL DESCRIPTION
Volume Set voice volume stands for volume, which can be heard from FXS
Gateway side (0~63, default: 28).
Set input gain stands for volume, which the opposite party hears
(0~38, default: 28).
Set dtmf volume stands for DTMF volume/level (0~31, default: 23).
Echo Canceller Setting enable/disable of echo canceller.
Jitter Buffer Setting of jitter buffer min/max delay.
OK [button] Click [OK] button to save your changes back to the FXS Gateway
volatile memory.
Note:
Be careful to change the voice parameters, because this
might cause incompatibility.