Android Question dtmf not send

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    

    
End Sub

Public Sub Initialize
    
End Sub


Sub Activity_Create(FirstTime As Boolean)
    
    
    If FirstTime Then
    End If
End Sub


Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
End Sub




Private Sub Button1_Click
    
        
    
    Dim p As PhoneCalls
    StartActivity(p.Call("89259644355"))
    
    Dim CurrentCall As SipAudioCall
    
    
    If CurrentCall.IsInCall  Then
        CurrentCall.SendDtmf(2)
        CurrentCall.SendDtmf(1)
    End If
    
    
    
[QUOTE]
End Sub