HP UX 11i Networking Links and Transports manual Protocol overview, Msp on hp-ux, Library features

hp-ux multimedia streaming protocols white paper

	December 2004
protocol overview	Real Time Protocol (RTP)
	Real Time Protocol (RTP) is a transport protocol that provides end-to-end
	network transport functions for applications transmitting data with real-time
	properties, such as interactive audio and video. These services include payload
	type identification; sequence numbering; time stamping and delivery
	monitoring. Applications run RTP on top of UDP.
	RTP consists of Real-Time Control Protocol (RTCP), a closely linked protocol,
	which provides a mechanism for reporting feedback on the transmitted real-
	time data.
	RTP can be used in the following scenarios:
	Multicast audio conference
	Audio and video conference
	Mixers and translators
	Real Time Streaming Protocol (RTSP)
	Real Time Streaming Protocol (RTSP) controls the transfer of real-time media
	data and serves as a network-remote-control for multimedia services. The client
	requests a selected media file from the server using RTSP. The server, in
	response, returns information required by the client to transfer the media data.
	Applications, which use HP-UX MSP libraries, run RTSP on top of TCP.
	Session Description Protocol (SDP)
	Session Description Protocol (SDP) describes the general real-time multimedia
	sessions. A multimedia client uses SDP to announce a conference session by
	periodically multicasting an announcement packet to a familiar multicast
	address and port using Session Announcement Protocol (SAP).
	SDP conveys information about media streams in multimedia sessions and
	allows the recipients of a session description to participate in the session. The
	primary use of SDP is in an Internetwork, but it is sufficiently general that it can
msp on hp-ux	describe multimedia conferences in other network environments.
	The MSP framework for HP-UX multimedia streaming servers includes libraries
	required for implementing the multimedia streaming protocols (RTP, RTSP, and
	SDP) and transmitting real-time data over remote networks. These libraries use
	underlying transport mechanisms, such as TCP and UDP, to deliver multimedia-
	streaming services.
	The MSP implementation on HP-UX offers greater benefits in terms of high
	performance, ability to take advantage of scalability, reliability, and high
	availability of the HP-UX operating system.
	MSP is available as a web release on the HP-UX 11i v1 and HP-UX 11i v2
	operating systems.
library features	The following lists the features that the MSP libraries support:
	RTP/RTCP
	Payload identification
	Sequence numbering

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