Summary


In this chapter, you learned how voice can be transported along with other data within your network; the following topics were presented:

  • The benefits of including voice within your data network.

  • How voice is transported across the network, including how it is digitized and then packetized.

  • The two ways that the packetization of voice is implemented:

    - Using traditional phones and a PBX (or digital phones attached to a PBX) to digitize the voice, and then connecting the PBX to a voice-enabled router to perform the packetization.

    - Using IP phones to digitize and packetize the voice. The call-processing function previously performed by the PBX is now handled by a call-processing manager such as CCM.

  • The two categories of voice traffic: conversation traffic (the audio, also called bearer traffic) and control (or signaling) traffic.

  • The components of an IP telephony system, including an underlying functioning and robust IP infrastructure and QoS support.

  • The hardware and software IP phones available from Cisco, the features of CCM, and the voice applications that can be supported.

  • The voice compression and coding techniques, including the recommended G.729 codec that compresses a call to 8 kbps while still maintaining voice quality.

  • Calculating the bandwidth requirements for voice traffic and understanding the associated terminology.

  • Examples of single-site and multisite IP telephony designs.

  • Security issues associated with IP telephony.




Campus Network Design Fundamentals
Campus Network Design Fundamentals
ISBN: 1587052229
EAN: 2147483647
Year: 2005
Pages: 156

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net