txgain no effect

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Hi All,

I have set following milliwatt and dial in from my mobile phone. and i adjust txgain value in chan_dahdi.conf but no effect on dahdi_monitor value is same. even i change its to 20 and more but monitor still showing same value. But i can hear tone variation on my mobile when i am changing txgain… is there any specific value i can set in txgain or leave it default 0.0

( # = Audio Level * = Max Audio Hit )
< ----------------(RX)----------------> < ----------------(TX)---------------->
#########################* 0) Tx: 4705 ( 4719)

[milliwatt]
;Asterisk rx/tx gain testing
exten => s,1,Answer
exten => s,n,PlayTones(1004/1000)
exten => s,n,Wait(300)