Post message on IP Phones initiated remotely

Version 1
    This document was generated from CDN thread

    Created by: Szilard Papp on 19-01-2014 10:50:37 AM
       I would like to send messages to IP phones initiated from a HTTP site. Is it possible to have pop up the message as soon as it is published trough the site or it can be only seen in the services menu?
       Right now I am able to write a message on the service screen using a variable(quite easy):

    <%@ Language=JavaScript %><%
    Response.ContentType = "text/xml";
    var greeting;
    greeting = "Hello world";
      <Title>Title text goes here</Title>
      <Prompt>The prompt text goes here</Prompt>
       <Text><% = greeting%></Text>

    How can I read the greeting from a file? The file would be able to accessed and updated on a http site. How can I make it appear on the phone without need to push anything?