从Twilio API调用操作方法时，会话值丢失

Question

从Twilio API调用操作方法时，会话值会丢失，但通过浏览器请求进行调用时，会话值将按预期工作。

public ActionResult ReceiveWhatsApp(SmsRequest incomingMessage)
        {
            System.Web.HttpContext.Current.Session["WhatsAppTo"] =   "whatsapp:+917503317910"; //incomingMessage.From;
            System.Web.HttpContext.Current.Session["WhatsAppMSG"] = incomingMessage.Body;
            ViewBag.JavaScriptFunction = string.Format("Display('{0}');", Convert.ToString(System.Web.HttpContext.Current.Session["WhatsAppMSG"]));

    return View("Index");
}

public JsonResult ReplyOnWhatsApp(string sms)
{
    try
    {
        if (!string.IsNullOrEmpty(Convert.ToString(System.Web.HttpContext.Current.Session["WhatsAppTo"])))
        {
            string To = System.Web.HttpContext.Current.Session["WhatsAppTo"].ToString();
            string accountSid = ConfigurationManager.AppSettings["WhatsAppAccountSid"].ToString();
            string authToken = ConfigurationManager.AppSettings["WhatsAppAuthToken"].ToString();

            TwilioClient.Init(accountSid, authToken);

            var message = MessageResource.Create(
                body: sms,
                from: new Twilio.Types.PhoneNumber("whatsapp:+14155238886"),
                to: new Twilio.Types.PhoneNumber(To)
            );

            status.isSuccess = true;
        }
        else
        {
            status.isSuccess = false;
            status.message = "User not connected";
        }
        return Json(status, JsonRequestBehavior.AllowGet);
    }
    catch (Exception ex)
    {
        status.isSuccess = false;
        return Json(status, JsonRequestBehavior.AllowGet);
    }
}