Hi Everyone..

Finally got solution how one can get back status from twilio. Just design an Http Handler and use the context property to get back the parameters
Below is the hanlder code:

 Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest





            Dim callsid = context.Request.Params.Get("CallSid")

            Dim FromNumber = context.Request.Params.Get("From")

            Dim ToNumber = context.Request.Params.Get("To")

            Dim callStatus = context.Request.Params.Get("CallStatus")



















            '


    End Sub