C++/VB - Enable SpeakerPhone in TAPI3

Asked By Jeff Faull

04-Feb-10 12:30 PM

I'm working on an alternative and augmentative communication (AAC) program and I'm attempting to add the ability to make and receive voice calls. I am using Julmar's ITapi3 wrapper in C#. I have managed to send and receive calls and send text to speech on demand. My issue is that I am unable to hear the other party.



In my mind the simplest solution would be to enable the speakerphone on the modem (in my case LSI softmodem H50113) but I have been unable to accomplish this. Alternatively I can use another terminal in my application but I have been unable to figure out how to switch terminals.



As an example to create a call:



_activeCall = _selectedModem.CreateCall(_dialNumber, AddressType, MediaType);

_playbackTerminal = _activeCall.RequestTerminal(TTerminal.FilePlaybackTerminal, TAPIMEDIATYPES.AUDIO, TERMINAL_DIRECTION.TD_CAPTURE);

_playbackTerminal.MediaPlayList = new[] { "test.wav" };

_activeCall.SelectTerminalOnCall(_playbackTerminal);

_activeCall.Connect(false);



This works well but if I then create a new terminal with the intention of listening I am unable to switch. The code below gives me the error, "The operation is not supported at this time." when I try to start the terminal.



case TERMINAL_MEDIA_STATE.TMS_IDLE:

_activeCall.UnselectTerminalOnCall(_playbackTerminal);

_playbackTerminal.Dispose();

_listenTerminal = _activeCall.RequestTerminal(TTerminal.MediaStreamTerminal, TAPIMEDIATYPES.AUDIO, TERMINAL_DIRECTION.TD_RENDER);

_activeCall.SelectTerminalOnCall(_listenTerminal);

_listenTerminal.Start();

break;



Any help/ideas appreciated

05-Feb-10 09:50 AM

After another day of trial and error I think I'm closer however I'm still having problems. I select and can use one terminal for file playback with no problems.



_playbackTerminal = _activeCall.RequestTerminal(TTerminal.FilePlaybackTerminal, TAPIMEDIATYPES.AUDIO, TERMINAL_DIRECTION.TD_CAPTURE);

_playbackTerminal.MediaPlayList = new[] { IdleWav };

_activeCall.SelectTerminalOnCall(_playbackTerminal);



I also select the static terminal for the speakers.



_speakerTerminal = _selectedModem.GetDefaultStaticTerminal(TAPIMEDIATYPES.AUDIO, TERMINAL_DIRECTION.TD_RENDER);

foreach (var stream in _activeCall.Streams.Where(stream => stream.MediaType == TAPIMEDIATYPES.AUDIO).Where(stream => stream.Direction == TERMINAL_DIRECTION.TD_RENDER))

{

stream.SelectTerminal(_speakerTerminal);

}



I keep getting the CME_FAIL event with the following trace:

ITapiTrace Verbose: 0 : Processing TapiCallMediaEventArgs: Event=CME_STREAM_FAIL, Call=TCall: 0 CS_CONNECTED, Cause=CMC_UNKNOWN, Stream=TStream: Wave MSP Render Stream AUDIO TD_RENDER, Terminal=TTerminal Speakers (2- High Definition Au AUDIO TD_RENDER TS_INUSE, Err=JulMar.Tapi3.TapiException (0x80004005): The operation failed - E_FAIL

ITapiTrace Verbose: 0 : TAPIEVENT: 0x10 IDispatch=0x7838C88

ITapiTrace Verbose: 0 : Processing TapiCallMediaEventArgs: Event=CME_STREAM_FAIL, Call=TCall: 0 CS_CONNECTED, Cause=CMC_BAD_DEVICE, Stream=TStream: Wave MSP Render Stream AUDIO TD_RENDER, Terminal=TTerminal Speakers (2- High Definition Au AUDIO TD_RENDER TS_INUSE, Err=JulMar.Tapi3.TapiException (0x80040006): The device is already in use.



I'm assuming this has to do with a half-duplex issue but I'm at a loss for how to fix it.

05-Feb-10 03:57 AM

Jeff,
to check whether speakerphone changes do want you want
you may want to try JulMar's Phone.exe: www.julmar.com/tapi
It is a TAPI2 test tool (incl. open source) that supports TAPI2 line and
phone devices.
The speakerphone stuff can be accessed via the "Phone" button after "Start
Sessioi".

--
Best Regards
Andreas Marschall
Microsoft MVP for TAPI / Windows SDK / Visual C++ 2003-2008
TAPI / TSP Developer and Tester
My TAPI and TSPI FAQ:
http://www.I-B-A-M.de/Andreas_Marschall's_TAPI_and_TSPI_FAQ.htm
My Toto® Tools (a collection of free, mostly TAPI related tools):
http://www.i-b-a-m.de/Andreas_Marschall's_Toto_Tools.htm
TAPI development around the world (Frappr! map):
http://www.frappr.com/TAPIaroundTheWorld
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05-Feb-10 10:06 AM

Thanks for the response. I have tried that. If I make a call and hit Speaker under Speakerphone I get a 0x9000001c error which according to MSDN means "The operation failed for an unspecified reason." I'm not sure what, if anything, that tells me.

05-Feb-10 10:37 AM

If I call into Phone.exe and answer the call the sound is piped through my speakers even though Handset and Speakerphone show OnHook.

05-Feb-10 01:20 PM

I've gotten it working but it feels hacky and results in quite a bit of lag. I can select either the Speakers or the FilePlayback terminals via:

_speakerTerminal = _selectedModem.GetDefaultStaticTerminal(TAPIMEDIATYPES.AUDIO, TERMINAL_DIRECTION.TD_RENDER);

or

_playbackTerminal = _activeCall.RequestTerminal(TTerminal.FilePlaybackTerminal, TAPIMEDIATYPES.AUDIO, TERMINAL_DIRECTION.TD_CAPTURE);

I can only have on selected on the terminal at a time. I'm assuming this is because the modem is half-duplex. I can switch back and forth from listening to talking by unselecting the current terminal and select the other like:

_activeCall.UnselectTerminalOnCall(_playbackTerminal);

_activeCall.SelectTerminalOnCall(_speakerTerminal);

or vice versa but this causes deadtime between each switch. Is this the only way to accomplish this or am I suffering from a conceptual error?