Android Question SIP SendDtmf(INT) description

[V.Wolpers]

Can someone explain how to use SendDtmf(Int)?

I have added the DTMF button to the program from this tutorial.

Android Sip / Voip tutorial

With the new Sip library you can make audio calls using Voip (Voice over IP) services. Sip features were added in Android 2.3 (API level 9). Note that not all devices above Android 2.3 support Sip features. In order to use this library you will need to set android.jar in Tools > Configure Paths...

www.b4x.com

Everything works as described in the tutorial. Only the DTMF tone is not generated.

Do I have to enter further parameters? e.g. sound duration, volume?

I cannot find a description of how SendDtmf is to be used and what requirements are necessary for it.

Where can I find a description or what is wrong in my code?

Private Sub btnDTMF_Click
    If CurrentCall.IsInitialized Then
        CurrentCall.SendDtmf(10)
    End If
End Sub

Complete program code as an attachment.

Thank you for any advice.

 

[Erel]

The description is:
Sends a Dtmf tone. Values can be 0-15, where 0-9 are the digits, 10 is '*', 11 is '# and 12-15 are 'A'-'D'.

Java documentation: https://developer.android.com/reference/android/net/sip/SipAudioCall#sendDtmf(int)

 

[V.Wolpers]

thank you Erel for the link.
But why does my code not send any tone?

 

[Erel]

Might be a problem in the underlying SIP SDK. As you can see the library code simply calls the native API.

 

[amorosik]

Might be a problem in the underlying SIP SDK. As you can see the library code simply calls the native API.

Do you mean that the phone has too old Android version?

 

[Erel]

I cannot say it. Check the unfiltered logs. Maybe there will be more information there.

The actual feature is implemented in the OS itself.

 

[V.Wolpers]

....Check the unfiltered logs.....

Where do I find this logs?

I try it with a Galaxy S9, Wiko Lenny, Xcover3, Xcover4 and Pixel2
All have different Android versions. No one generates a tone.

 

[Erel]

Worth trying with a different SIP server.