TAPI Call program

[C++ Programming]

Hi

I have writen a TAPI program that can call (works fine)

I want to speak via headset not picking up a phone.
I can do this with Venta Fax & Voice program in my PC (so the modem supports this), but my program can not do this (no sounds send/receive).

Is there any tricks in TAPI function for this?

I have used LINEMEDIAMODE_AUTOMATEDVOICE for lineOpen function like this:

lineOpen(m_hLineApp, m_nDevID, &m_hLine, dwTAPIVer, 0, 1, LINECALLPRIVILEGE_MONITOR | LINECALLPRIVILEGE_OWNER, LINEMEDIAMODE_AUTOMATEDVOICE, NULL);
Regards
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