OfficeSIP Server is freeware SIP server for Windows developed by OfficeSIP Communications since 2007. It is focused on enterprise uses: implements Windows Single Sign-On feature and pull-in users details from Active Directory. OfficeSIP Server is stateful SIP proxy server and registrar. The server implements UDP and TCP transport protocols. It also implement part of presence-related Microsoft extensions to the SIP, and partially compatible with Microsoft Unified Communications Client API. The server is .NET Framework application. It is compatible with hardware SIP phones and all popular software SIP clients: X-Lite, Windows Messenger and etc, but the server is focused on OfficeSIP Messenger.
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