https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 Specifies the Session Initiation Protocol (SIP) Routing Extensions, which are Session Initiation Protocol (SIP) routing extensions to provide endpoint identification, phone number resolution, call routing processing by server on user's behalf, and enhanced routing within topologies with multiple redundant servers, firewalls, and NAT devices. https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 11.0<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE].pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-210817.docx">DOCX</a></li></ul> Tue, 17 Aug 2021 MS-SIPRE-20210817 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 10.1<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-201117.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-201117.docx">DOCX</a></li></ul> Tue, 17 Nov 2020 MS-SIPRE-20201117 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 10.1<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-200818.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-200818.docx">DOCX</a></li></ul> Tue, 18 Aug 2020 MS-SIPRE-20200818 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 10.0<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-180828.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-180828.docx">DOCX</a></li></ul> Tue, 28 Aug 2018 MS-SIPRE-20180828 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 9.0<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-180724.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-180724.docx">DOCX</a></li></ul> Tue, 24 Jul 2018 MS-SIPRE-20180724 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 8.0<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-180427.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-180427.docx">DOCX</a></li></ul> Fri, 27 Apr 2018 MS-SIPRE-20180427 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 7.1<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-161215.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-161215.docx">DOCX</a></li></ul> Thu, 15 Dec 2016 MS-SIPRE-20161215 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 7.0.1<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-160914.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-160914.docx">DOCX</a></li></ul> Wed, 14 Sep 2016 MS-SIPRE-20160914 https://docs.microsoft.com/en-us/openspecs/office_protocols/MS-SIPRE/ab4ab249-3796-4ed1-8cec-f496d81a1a83 <b>Protocol Revision:</b> 7.0.1<br/><b>Downloads:</b><br/><ul style="list-style-type: square;"><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-160715.pdf">PDF</a></li><li><a href="https://interoperability.blob.core.windows.net/files/MS-SIPRE/[MS-SIPRE]-160715.docx">DOCX</a></li></ul> Fri, 15 Jul 2016 MS-SIPRE-20160715