How can I program the speakerphone on a pocketpc running Windows Mobile 6.5?

Question

Thanks to Josef who put me onto the right track for coding Windows Mobile 6.5 phone support.

I have found some more tricks which I would like to share. Yes, I know it is old technology, but there are many devices being sold that still run mobile 6.5. So: How can I program the speakerphone on a pocketpc running Windows Mobile 6.5 in .NET Compact Framework 3.5 in VB.NET?

Answer 1

This is very simple once you know how. You call the DLL file ossvcs, but this DLL file exports functions by ordinal numbers, not by names.

See http://msdn.developer-works.com/article/12376405/Reject+Call for more details. The code follows:

<DllImport("ossvcs.dll", EntryPoint:="#218")> _
Private Shared Sub setSpeaker(ByVal sValue As Integer)
End Sub

' Call setSpeaker(1) to turn on and setSpeaker(0) to turn off.
' If you set the speaker on when you create the line than it will always turn the speaker on for every call made