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Voice and Video over Ip

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Voice and Video over Ip
Objectives
Use terminology specific to converged networks
Explain VoIP (voice over IP) services and their user interfaces
Explain video-over-IP services and their user interfaces
Describe VoIP and video-over-IP signaling and transport protocols, including SIP, H.323, and RTP
Understand QoS (quality of service) assurance methods critical to converged networks, including RSVP and DiffServ
Terminology
IP Telephony
IP telephony (VoIP)
• Any network carrying voice signals using TCP/IP
Public or private
• Runs over any packet-switched network
VoATM (voice over ATM)
VoDSL (voice over DSL)
Data connection types carrying VoIP signals
• T-carriers, ISDN, broadband cable, satellite connections, WiFi, WiMAX, cellular telephone networks
IP Telephony
Internet telephony
• VoIP relies on Internet
• Advantage: breadth and low cost
Private lines can also carry VoIP calls
• Effective and economical
• Network congestion control capabilities
Better sound quality
Non-Data Applications
Other non-data applications on converged networks
• FoIP (Fax over IP)
• IPTV (IP television)
• Videoconferencing
Multiple participants communicate and collaborate via audiovisual means
• Streaming video
Compressed video delivered in continuous stream
Hulu.com for free Internet TV shows
• Webcasts
Streaming videos supplied via the Web
Terminology
Multicasting
• One node transmits same content to every client in group
Video over IP
• IPTV, videoconferencing, streaming video, IP multicasting
Unified communications (unified messaging) service
• Several communication forms available from single user interface

VoIP (Voice over IP) Applications and Interfaces
VoIP (Voice over IP) Applications and Interfaces
Significant VoIP implementation reasons
• Lower voice call costs (toll bypass)
• New, enhanced features and applications
• Centralize voice and data network management
Voice and data configurations
• Traditional telephone (sends, receives analog signals)
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