Voice Technologies

Páginas: 49 (12053 palabras) Publicado: 27 de enero de 2013
CCNA Voice IIUC (640-460)
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CCNA Voice IIUC (640-460) Legal notice and disclaimer .......................................................................................................................... 5 Introduction.................................................................................................................................................. 6 Definitions ................................................................................................................................................ 6 Well Known Ports ..................................................................................................................................... 6 Miscellaneous commands........................................................................................................................ 7 POTS Technologies ....................................................................................................................................... 8 Analogue Connections.............................................................................................................................. 8 PSTN Signalling ......................................................................................................................................... 8 E1 / T1 Signalling ...................................................................................................................................... 9 IP Voice Technologies................................................................................................................................. 11 Cisco Voice Infrastructure Model ........................................................................................................... 11 Signalling ................................................................................................................................................. 12 IPTransport ............................................................................................................................................ 13 IP Overhead ............................................................................................................................................ 13 Compressed RTP..................................................................................................................................... 14 Problems with Digital Voice.................................................................................................................... 14 Causes of Delay....................................................................................................................................... 14 QoS......................................................................................................................................................... 14 AutoQoS.................................................................................................................................................. 15 MQC – Modular QoS CLI......................................................................................................................... 15 Analogue to Digital Conversion / Codecs ................................................................................................... 17 Conversion .............................................................................................................................................. 17 Codec Summary...................................................................................................................................... 17 G711 ....................................................................................................................................................... 17 Numbering Plans ........................................................................................................................................ 19 PSTN...
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