DTMF Detection Problem With Analog Card

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Hi all. I have a DTMF detection problem by my new analog card (ATCOM 2 FXO port). When i`m playing a voice with ‘GET DATA’ AGI command, sometimes asterisk do not receive DTMF from caller while the voice is playing. But if user waits to the end of playing voice, there is no problem.

I`m using Asterisk 10.3.1, dahdi-2.6.1 on CentOS.6.4. Could you please help me?
Here is my configs:

system.conf:
—————-
fxsks=1
fxsks=2
loadzone