SL808X DTMF tone send error

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?

Logs aren’t much use without seeing the code that generated them!

Not sure what you mean by, “mobile speaker” here?

A diagram of your setup would probably be the clearest way to explain…