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1. IP Internetwork.pptx
- 1. IP Internetwork • IP is connectionless. • IP provides multiple paths from source to destination.
- 3. VoIP Protocols and the OSI Model
- 4. Bandwidth Implications of Codec
- 5. Impact of Voice Samples
- 6. Picture
- 7. IP address to Phone Number • VoIP look for IP address • Translate Phone numbers to IP addresses • The central call processor is a piece of hardware running a specialized database/mapping program called a soft switch. • Soft switches know: • Where the endpoint is on the network • What phone number is associated with that endpoint • The current IP address assigned to that endpoint • If soft switch does not have the information, the request is handled by another soft switch.
- 8. Protocols • Used to connect different pieces of hardware. • H.323 • Most widely used protocol • provides specifications for real-time, interactive videoconferencing, data sharing and audio applications (VoIP) • SIP • More streamlined protocol • Developed specifically for VoIP • Lack of a standard protocol is a problem. Not always compatible.
- 9. Advantages • Cost • Free VoIP to VoIP • Low cost VoIP to Public Switch Telephone Network (PSTN) • Less bandwidth requirements • Low cost / no cost software and hardware • Mobility • Any internet connection • Growing number of wireless broadband locations
- 10. VoIP Architectures • PC to PC Internet
- 11. VoIP Architectures • Phone to Phone via the Internet Internet
- 12. VoIP Architectures • Phone to Internet to Gateway to PSTN Internet GATEWAY PSTN
- 13. Cisco 7970 IP Phone
- 14. IP hard phones
- 16. Media gateway • An active device for interfacing PSTN lines to VoIP server. • Available in 8, 16 and 24 port denominations • Converts analog signals to digital and vice versa • H.323 protocol used between VoIP server and media gateway for call handling
- 17. Codec Acronym for coder-decoder Separate codec used for audio and video One of the function is to compress the raw audio / video to save bandwidth Efficiency of codec determines the quality of audio / video Popular audio codecs G711, G722, G723, G726, G729 Popular video codecs H261, H263, H264
- 18. Schematic of a VoIP setup
- 19. Signal flow in VoIP
- 20. How a VoIP phone is connected Do not need additional data and power point Single data point serve both PC & Phone POE (Power Over Ethernet) provide power for VoIP phone VoIP POE enabled
- 21. Integrated TIFR voice communication system