#########iax.conf
[411]
callgroup=9
pickupgroup=9

[401]
callgroup=9
pickupgroup=9

[402]
callgroup=9
pickupgroup=9

#######features.conf
pickupexten => *5
atxfer => *2

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I did a reload on res_features.so
I also tried to change dtmfmode between rfc2833 and inband, with no sucess...