public static void SendMT(LoginParams secureParams, MtParams mtParams, PhoneParams phoneParams)
        {
            var doc = new XmlOutput();
            doc.XmlDeclaration().Node("request").Within()
                .Node("transaction").InnerText(secureParams.TransactionID.ToString())
                .Node("user").Within()
                    .Node("login").InnerText(secureParams.Login)
                    .Node("pwd").InnerText(secureParams.Password)
                .EndWithin()
                .Node("msg").Within()
                    .Node("format").InnerText(mtParams.Format)
                    .Node("text").InnerText(mtParams.Text, true)
                    .Node("url").InnerText(mtParams.URL)
                    .Node("nc").InnerText(mtParams.NumeroCorto)
                .EndWithin()
                .Node("phone").Within()
                    .Node("ani").InnerText(phoneParams.ANI)
                    .Node("op").InnerText(phoneParams.Op)
                .EndWithin()
            .EndWithin();

            SecureRequest(secureParams, doc.GetOuterXml());
        }