ITBasicCallControl2 bcc;
bcc = (ITBasicCallControl2)line.CreateCall(textBox1.Text, TapiConstants.LINEADDRESSTYPE_IPADDRESS, TapiConstants.TAPIMEDIATYPE_AUDIO);
bcc.Connect(false);

ITTerminal recordTerminal;
ITMediaRecord mediaRecord;
ITCallInfo callInfo = (ITCallInfo)bcc;

recordTerminal = bcc.RequestTerminal(TapiConstants.CLSID_String_FileRecordingTerminal, TapiConstants.TAPIMEDIATYPE_MULTITRACK, TERMINAL_DIRECTION.TD_CAPTURE);
mediaRecord = (ITMediaRecord)recordTerminal;
mediaControl = (ITMediaControl)recordTerminal;
mediaRecord.FileName = "test.wav";

bcc.SelectTerminalOnCall(recordTerminal);
mediaControl.Start();