how to make phone call using c#by fax-modem in widnows 10

i'm need to make phone call using Dell USB dialup modem in widnows 10 by C#

i'm tried some sample code like tapi 3 by all of theme have same Error

There is no connection for this connection ID (Exception from HRESULT: 0x80040004 (OLE_E_NOCONNECTION))

I used this Projects https://www.codeproject.com/Articles/10994/TAPI-3-0-Application-development-using-C-NET https://code.msdn.microsoft.com/windowsdesktop/TAPI-3-in-C-Get-Lines-and-dd143eaf