The TAPICLIENT_LineSetMediaControl function is called during a call to the lineSetMediaControl function.
LONG TAPICLIENT_LineSetMediaControl(
HMANAGEMENTCLIENT hmClient,
LPTAPIPERMANENTID lpPermanentID,
LPLINEMEDIACONTROLDIGIT const lpDigitList,
DWORD dwDigitNumEntries,
LPLINEMEDIACONTROLMEDIA const lpMediaList,
DWORD dwMediaNumEntries,
LPLINEMEDIACONTROLTONE const lpToneList,
DWORD dwToneNumEntries,
LPLINEMEDIACONTROLCALLSTATE const lpCallstateList,
DWORD dwCallstateNumEntries
);
lineSetMediaControl, TAPICLIENT_ClientInitialize, TAPIPERMANENTID