title: SIP SUBSCRIBE receives multiple NOTIFY
body: <p>I'm writing a SIP client, and I'm having some weird issues when using <code>SUBSCRIBE</code> to an existing client (different, freeware software)</p>
  
  <p>I'm using my own server, but it's not the problem because if I'm doing a <code>SUBSCRIBE</code> from a different client (pjsip), it all works fine.</p>
  
  <p>I'm sending out this <code>SUBSCRIBE</code> message:</p>
  
  <pre><code>SUBSCRIBE sip:3009@10.0.0.4 SIP/2.0
  Via: SIP/2.0/UDP 10.0.0.7:5060;rport;branch=z9hG4bKPj3893ccd****************
  Max-Forwards: 70
  From: &lt;sip:10.0.0.7&gt;;tag=023a965a14a143eb8*******
  To: sip:3009@10.0.0.5;tag=8cfb7*********
  Contact: &lt;sip:10.0.0.7:5060;ob&gt;
  Call-ID: bf5d48fe8ca0***************
  CSeq: 14388 SUBSCRIBE
  Route: &lt;sip:10.0.0.5;lr;ftag=023a965a14a143eb8*********&gt;
  Event: presence
  Expires: 600
  Supported: replaces, 100rel, timer, norefersub
  Accept: application/pidf+xml, application/xpidf+xml
  Allow-Events: presence, message-summary, refer
  Content-Length:  0
  </code></pre>
  
  <p>After that message, an <code>OK</code> is received, but then I'm receiving a <code>NOTIFY</code> message for every presence change that the other client did since HE registered to the server.</p>
  
  <p>The problem doesn't happen with different clients..</p>
  
  <p>If it matters, I'm developing on <code>Visual Studio 2008</code> on Windows 7 64bit</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks!</p>