title: Close distant USSD session
body: <p>I am working on a USSD client. Everything works fine except for closing a distant USSD session. </p>
  
  <p>In the specification, we can see the function CUSD:
  AT+CUSD=2 should close the USSD session, but this is not really the case.</p>
  
  <p>In fact when I do this sequence:</p>
  
  <pre><code>AT+CUSD='#xxx#',12
  AT+CUSD='1',12
  </code></pre>
  
  <p>I have an open distant connection.
  On your handset, you can open a new session by dialing #xxx*#</p>
  
  <p>If I send a:</p>
  
  <pre><code> AT+CUSD='#xxx*#',12
  </code></pre>
  
  <p>This is not opening a new distant session.
  If I send a:</p>
  
  <pre><code>AT+CUSD=2
  AT+CUSD='#xxx#'
  </code></pre>
  
  <p>This is not opening a new distant session.</p>
  
  <p>Do you know how to close a distant session?
  I am working with huwaei key E160 and E173 on windows or Linux.</p>