Could you check DTMF log as below,
(Logs)
2014/11/05;10:32:57:926;001;ADL;2;DTMF Keyboard sample main
2014/11/05;10:32:57:942;002;ADL;2;Voice call TX subscription : Failed
2014/11/05;10:36:06:490;001;ADL;2;Play DTMF 3 on speaker : 0 // I can listened dtmf tone via speaker
2014/11/05;10:36:06:490;002;ADL;2;Play DTMF 3 on Voice Call TX : -3 // But I can not listen dtmf tone via mobile speaker
[Q1] Is It means ADL_RET_NOT SUPPORT?
and How can send DTMF tone to mobile speaker?