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Media Streaming over RTP

Introduction

RTP, the real-time transport protocol, provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. RTP does not address resource reservation and does not guarantee quality-of- service for real-time services.

The DSP Series 2 card supports the direct termination of G.711 u-law RTP streams (payload size: 20 milliseconds) from any third party media server or speech server, required for Automatic Speech Recognition (ASR), Text To Speech (TTS), or any CTI applications using voice recognition.

Configuration

See Media Streaming over RTP to configure this feature.

Definitions

The following definitions are taken from RFC 1889, RTP: A Transport Protocol for Real-Time Applications.

RTP Payload

The data transported by RTP in a packet, for example audio samples or compressed video data.

RTP Packet

A data packet consisting of the fixed RTP header, a possibly empty list of contributing sources, and the payload data. Some underlying protocols may require an encapsulation of the RTP packet to be defined. Typically one packet of the underlying protocol contains a single RTP packet, but several RTP packets may be contained if permitted by the encapsulation method.

Port

The abstraction that transport protocols use to distinguish among multiple destinations within a given host computer. TCP/IP protocols identify ports using small positive integers. RTP depends upon the lower-layer protocol to provide some mechanism such as ports to multiplex the RTP and RTCP packets of a session.

Transport Address

The combination of a network address and port that identifies a transport-level endpoint, for example an IP address and a UDP port. Packets are transmitted from a source transport address to a destination transport address.

RTP session

The association among a set of participants communicating with RTP. For each participant, the session is defined by a particular pair of destination transport addresses (one network address plus a port pair for RTP and RTCP).

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.
Digital Signal Processor
The point in the Excel platform where a DS0 connects to a network. Also known as a "socket."
Transmission Control Protocol / Internet Protocol. A networking protocol that provides communication across interconnected networks.
Real-Time Transport Control Protocol.
Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.