title: How to get all incoming calls for all users in UCMA with an Application Endpoint
body: <p>I try to register a handler for incoming calls for all Lync Users. The problem is I cannot store all the Credentials that are needed when using a UserEndpoint. At the moment I have managed to retrieve all Lync Users and also their online state with a hard coded service UserEndpoint.</p>
  
  <p>As I already figured out, you cannot listen for incoming calls with an ApplicationEndpoint, so do I need a UserEndpoint for every Lync User? I read somewhere that it is possible to create a UserEndpoint without Credentials in a trusted Application. </p>
  
  <p>In theory I already created a trusted application relationship between the Lync Front End Server and the Application Server and also registered the TrustedApplicationEndpoint. I just can't be sure if it is really working as I do not get a different result when changing the trustedapplicationname or any of the other settings.</p>
  
  <p>Is there another way to solve this problem?<br />
   If not what do I have to do to listen for all incoming Calls?</p>