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    <title>[MS-OCPSTN]: Session Initiation Protocol (SIP) for PSTN Calls Extensions</title>
    <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
    <description>Specifies the Session Initiation Protocol (SIP) Extensions for PSTN Calls, which is a set of extensions for interfacing a client with other traditional telephony networks, such as the Public Switched Telephone Network (PSTN) and an Internet Protocol Private Branch eXchange (IP-PBX) or enterprise PBX.</description>
    <item>
      <title>Major Update for [MS-OCPSTN] (Version 10.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 10.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN].pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-240820.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 20 Aug 2024</pubDate>
      <guid>MS-OCPSTN-20240820</guid>
    </item>
    <item>
      <title>Major Update for [MS-OCPSTN] (Version 9.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 9.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-210817.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-210817.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 17 Aug 2021</pubDate>
      <guid>MS-OCPSTN-20210817</guid>
    </item>
    <item>
      <title>No Update for [MS-OCPSTN] (Version 8.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 8.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-190618.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-190618.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 18 Jun 2019</pubDate>
      <guid>MS-OCPSTN-20190618</guid>
    </item>
    <item>
      <title>Major Update for [MS-OCPSTN] (Version 8.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 8.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-180828.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-180828.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 28 Aug 2018</pubDate>
      <guid>MS-OCPSTN-20180828</guid>
    </item>
    <item>
      <title>Major Update for [MS-OCPSTN] (Version 7.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 7.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-180724.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-180724.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 24 Jul 2018</pubDate>
      <guid>MS-OCPSTN-20180724</guid>
    </item>
    <item>
      <title>Major Update for [MS-OCPSTN] (Version 6.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 6.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-180427.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-180427.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Fri, 27 Apr 2018</pubDate>
      <guid>MS-OCPSTN-20180427</guid>
    </item>
    <item>
      <title>No Update for [MS-OCPSTN] (Version 5.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 5.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-160929.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-160929.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Thu, 29 Sep 2016</pubDate>
      <guid>MS-OCPSTN-20160929</guid>
    </item>
    <item>
      <title>No Update for [MS-OCPSTN] (Version 5.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 5.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-160914.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-160914.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Wed, 14 Sep 2016</pubDate>
      <guid>MS-OCPSTN-20160914</guid>
    </item>
    <item>
      <title>No Update for [MS-OCPSTN] (Version 5.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-OCPSTN/6e69d8d4-ba59-484f-9f2f-61d8ee4ed0d9</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 5.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-160715.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OCPSTN/[MS-OCPSTN]-160715.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Fri, 15 Jul 2016</pubDate>
      <guid>MS-OCPSTN-20160715</guid>
    </item>
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