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					          Voice over IP

                  Prepared for
               Dr. Samir Ghadhban

Hani Al Ruwaili 221942 - Abdulkrem Al Zhrani 232701
             What is VoIP ?
   It is the technology that allows us to
    have phone service over the
VoIP Protocol & OSI Layers
          Application Layer
   Soft Phone ( Skype,Net2phon )
   Audio card
   Firewall OFF
          Presentation Layer
   Codecs
    • PSTN – PCM (Pulse Code Modulation)
    • VoIP compression
    • Free Codecs (speex,GSM)
             Session Layer
   Session Initiation Protocol (SIP)
    • Authentication
    • Communication type
    • Take care of IP addresses and ports
      numbers while transmitting data
              Transport Layer
   Real Time Protocol
    • Monitors the quality of the data distribution
      and provides control information
    • RTP header compression saves bandwidth by
      compressing packet headers
    • Provides a separate flow from RTP for UDP
      transport use
            VoIP Hardware
   Soft Phone
   VoIP telephones 100~300 $
    • Bandwidth
    • Friendly Interface (WAP)
    • Audio Port
   PSTN interface cards
   Analogue Telephone Adaptors (ATA)
PSTN interface cards
Analogue Telephone Adaptors (ATA)
             Quality of Service
   Latency (Delay)
    • High Priority
   Jitter
    • Jitter Buffer
   For people who adopting
    communications with, VoIP can save
    on infrastructure costs

Questions any one ?