Tapi 3.0 com problem

[Cyber Bandit]

hey guys,
i am writing an application using COM for dialling a phone num using tapi 3.0. the problem is while using the QueryMediaType interface the first parameter should be TAPIMEDIATYPE_AUDIO etc. but when i use this in my func there is compiler err. after reading Tapi3.h there is no const such as TAPIMEDIATYPE_AUDIO but there are other like TAPIMEDIATYPE_String_AudioOut but if I use them in my code the application crashes. please help me out of this mess.
herz the code.........

ITTAPI *pTapi;
	HRESULT hr = CoCreateInstance(CLSID_TAPI, NULL, CLSCTX_INPROC_SERVER,
		IID_ITTAPI, (LPVOID *)&pTapi);
	if(SUCCEEDED(hr))
	{
		hr = pTapi->Initialize();
		if(!SUCCEEDED(hr))
			return 0;
	}
	IEnumAddress *pEnumAddress;
	ITAddress *pAddress;
	ITMediaSupport *pMediaSupport;
	pTapi->_EnumerateAddresses(&pEnumAddress);
	while(S_OK == pEnumAddress->Next(1, &pAddress, NULL))
	{
		VARIANT_BOOL bSupport;
		pAddress->QueryInterface(IID_ITMediaSupport, (void**)&pMediaSupport);
		hr = pMediaSupport->QueryMediaType(TAPIMEDIATYPE_AUDIO , &bSupport);
		
		if(bSupport)
		{
			break;
		}
	}

thanx in advance
Regards,
Bandit

[Cyber Bandit]

Hey guruz wat hapnd. wat hapnd none have replied to my problem. cud anyone help me out here.
thanx

[ivrub]

tapi3if.h