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    <tt>Hi, Jonathan!<br>
      <br>
      To be honest, I haven't fully implemented a push notification
      solution myself, but I've seen some deployments doing it.
      Basically, when a client registers, you need to store the PRID in
      a database, and when a call comes to that client, you need to do a
      REST query to the associated PNS provider, with that ID.<br>
      The implementation of this service goes hand in hand with Event
      Based Routing[1] we've been talking about for a while - using this
      mechanism you can "delay" a call until the client re-registers, so
      you can forward the call to it.<br>
      Hope this is helpful. If anyone has a working example that he has
      successfully deployed, I am also curious about his story :).<br>
      <br>
      [1]
<a class="moz-txt-link-freetext" href="https://blog.opensips.org/2017/03/10/advanced-sip-scenarios-with-event-based-routing/">https://blog.opensips.org/2017/03/10/advanced-sip-scenarios-with-event-based-routing/</a><br>
      <br>
      Best regards,<br>
    </tt>
    <pre class="moz-signature" cols="72">Răzvan Crainea
OpenSIPS Developer
<a class="moz-txt-link-abbreviated" href="http://www.opensips-solutions.com">www.opensips-solutions.com</a></pre>
    <div class="moz-cite-prefix">On 11/27/2017 01:40 PM, Jonathan Hunter
      wrote:<br>
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        <div><span style="font-size: 12pt;">Hi Guys, </span><br>
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        <div>We use opensips in the core of our network and are looking
          to implement Push Notification with the Session Initiation
          Protocol (SIP), as per this spec;</div>
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        <div><a class="moz-txt-link-freetext" href="https://tools.ietf.org/id/draft-holmberg-sipcore-sip-push-02.html">https://tools.ietf.org/id/draft-holmberg-sipcore-sip-push-02.html</a></div>
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        <div><span style="font-size: 12pt;">Can anyone recommend a push
            server software that can be used in the scenario, that
            opensips can integrate with?</span><br>
        </div>
        <div><br>
        </div>
        <div>I can see there are plenty of open source options out
          there, just wondered if anyone else had implemented?</div>
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        <div>Thanks</div>
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        <div>Jon</div>
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