Microsoft Media Server (MMS), a Microsoft proprietary network-streaming protocol, serves to transfer unicast data in Windows Media Services (previously called NetShow Services). MMS can be transported via UDP or TCP. The MMS default port is UDP/TCP 1755.
Microsoft deprecated MMS in favor of RTSP (TCP/UDP port 554) in 2003 with the release of the Windows Media Services 9 Series, but continued to support the MMS for some time in the interest of backwards compatibility. Support for the protocol was finally dropped in Windows Media Services 2008.[1]
As of 2012[update] Microsoft still recommends[1] using "mms://" as a "protocol rollover[2] URL". As part of protocol rollover a Windows Media Player version 9, 10, or 11 client opening an "mms://" URL will attempt to connect first with RTSP over UDP and if that fails it will attempt RTSP over TCP. After an RTSP attempt fails, Windows Media Player versions 9 & 10 will attempt MMS over UDP, then MMS over TCP.[3] If using Windows Media Player 11 and an RTSP attempt fails, or if using a previous version of Windows Media Player and MMS fails, a modified version of a HTTP over TCP connection will be attempted. This modified version is referred to by some third parties as MMSH,[4] and by Microsoft as MS-WMSP (Windows Media HTTP Streaming Protocol).[5] The URI scheme "mms://" has also been proposed to be used for the unrelated Multimedia Messaging Service (MMS) protocol.[1]
For several years developers of the SDP Multimedia download-tool reverse-engineered the MMS protocol and published unofficial documentation for it. However, Microsoft finally released the protocol specification in February 2008.[6]
Programs supporting MMS
See also
- Windows Media Services
- Streaming Download Project
- Windows Media Station
References
- ^ a b Microsoft's Windows Media Networking Protocols Porting Kit
- ^ Microsoft's Windows Media Format 11 SDK Protocol Rollover
- ^ Protocol Rollover
- ^ MMSH - VideoLAN Wiki
- ^ http://msdn.microsoft.com/en-us/libra ry/cc251059.aspx Windows Media HTTP Streaming Protocol Specification
- ^ http://sdp.ppona.com/news2008.html
External links
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