我正在尝试在voip呼叫期间发送dtmf。 为了做到这一点我使用如何在Android上使用pjsip发送dtmf？

mCall.dialDtmf(String.valueOf(dtmf));

MCALL它的调用方式PJSIP。 当这个函数被调用我赶上例外：

04-25 16:03:57.867 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: java.lang.Exception: Title: pjsua_call_dial_dtmf(id, &pj_digits)

04-25 16:03:57.867 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: Code: 70013

04-25 16:03:57.867 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: Description: Invalid operation (PJ_EINVALIDOP)

04-25 16:03:57.867 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: Location: ../src/pjsua2/call.cpp:551

04-25 16:03:57.879 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at org.pjsip.pjsua2.pjsua2JNI.Call_dialDtmf(Native Method)

04-25 16:03:57.879 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at org.pjsip.pjsua2.Call.dialDtmf(Call.java:143)

04-25 16:03:57.879 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at com.kaymera.kphoneapp.voipEngine.PJCall.dialDtmf(PJCall.java:115)

04-25 16:03:57.879 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at com.kaymera.kphoneapp.voipEngine.calls.VoipCall.sendDTMF(VoipCall.java:149)

04-25 16:03:57.879 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at kphoneapp.kymera.kvoip.myapplication.MainActivity.generateDtmf(MainActivity.java:223)

04-25 16:03:57.880 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at kphoneapp.kymera.kvoip.myapplication.MainActivity$$ViewBinder$11.doClick(MainActivity$$ViewBinder.java:110)

04-25 16:03:57.880 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22)

04-25 16:03:57.880 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at android.view.View.performClick(View.java:4764)

04-25 16:03:57.880 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at android.view.View$PerformClick.run(View.java:19844)

04-25 16:03:57.880 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:739)

04-25 16:03:57.880 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)

04-25 16:03:57.881 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at android.os.Looper.loop(Looper.java:135)

04-25 16:03:57.881 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5349)

04-25 16:03:57.881 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at java.lang.reflect.Method.invoke(Native Method)

04-25 16:03:57.881 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)

04-25 16:03:57.881 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)

04-25 16:03:57.881 19670-19670/kphoneapp.kymera.kvoip.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)

我怎样才能解决呢？

2016-04-26

Pein