1.4 Relationship to Other Protocols
The MMS Protocol relies on TCP for the connection that controls the streaming media session. MMS Protocol messages are sent over the TCP connection by both the client and the server. The multimedia data that is being transferred by the server is sent over either TCP or UDP.
The client also relies on UDP for sending requests that ask the server to resend lost UDP packets.
The MMS Protocol is similar in functionality to the Real-Time Streaming Protocol (RTSP) Windows Media Extensions [MS-RTSP]. However, RTSP extensions support functionality that is not available in MMS.