[Freeswitch-users] How to increase audio level for a channel's incoming (read) audio?

[tangdu]

Hello everyone
I have question about audio gain.
Hers is the case
  <action application="set_audio_level" data="read 4"/>
<action application="bridge"
data="{absolute_codec_string='G729'}sofia/gateway/sip_trunk/xxxxxx"/>

"set_audio_level"  is only for conference,useless in this case.

How to increase audio level for a channel's incoming  audio?
Thanks in advance



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