private void API_PlaceCall(string target, CallTypes type)
        {
            string content = XmlDeclaration + "<dial type=\"" + type.ToString() + "\">\r\n <number>" + target + "</number>\r\n <displayName></displayName>\r\n</dial>";
            string msg     = ConstructApiMessage(ApiRequests.call, content);

            SendMessage(msg);
        }