The TAPICLIENT_LineSetCallParams function is called during a call to the lineSetCallParams function.
LONG TAPICLIENT_LineSetCallParams(
HMANAGEMENTCLIENT hmClient,
LPTAPIPERMANENTID lpPermanentID,
DWORD dwBearerMode,
DWORD dwMinRate,
DWORD dwMaxRate,
LPLINEDIALPARAMS lpDialParams
);
LINEDIALPARAMS, lineSetCallParams, TAPICLIENT_ClientInitialize, TAPIPERMANENTID