In order to transport streaming media, such as telephony and video teleconference applications over IP networks, multiple protocols (RTSP, SIP, RTP, H.323) are involved to provide setup, communication control, and data transport.
- [Narrator] Demand for…multimedia applications is increasing.…There are three broad internet-based multimedia categories:…streaming stored audio video, streaming live audio video,…and interactive videoconferencing.…In order to transmit streaming media successfully,…multiple protocols are necessary…to provide setup, data transport, and communication control…over an IP network.…
The suite of real-time protocols includes…Real-Time Transport Protocol, transports audio and video;…Real-Time Control Protocol, carries control information;…Real-Time Streaming Protocol,…establishes and controls multimedia sessions.…Real-Time Transport Protocol…is a transport protocol for media…that is multicast friendly…and has many encoding possibilities.…
Many times, Real-Time Protocol is over UDP,…which is a lightweight transport protocol.…In order to ensure additional information…about the transmission,…RTP has a number of different TCP-like fields…such as sequence number, timestamp, and source identifier.…Here we see an RTP header and the fields within.…
Lisa Bock compares the traditional Public Switched Telephone Network (PSTN) to VoIP, and discusses the framework and components necessary for VoIP to be possible. She reviews codecs, including characteristics such as bitrate and voice quality; protocols for setup, communication control, and data transport; and media gateways, signaling protocols, and intermediary systems such as translators and mixers. Lisa then reviews business integration and the importance of conducting a needs analysis and network assessment prior to implementation. Learn about the many value-added services UC can provide, such as integrating VoIP with email, billing, management software, and other customer management systems. Lisa wraps up with a discussion on how ensuring quality of service (QoS) in a VoIP network minimizes latency and jitter and the importance of VoIP security to prevent malware, impersonation, hijacking, and denial of service attacks.
- History and evolution of PSTN
- UC overview and components
- Gateways, including signaling gateways, translators, and mixers
- Integrating VoIP and UC into your business network