Vo IP Phone - Elements of A VoIP Phone

Elements of A VoIP Phone

  • Physical Hardware
  • DNS client
  • STUN client
  • DHCP client (not commonly used)
  • Signalling stack (SIP, H.323, Skinny, Skype, or others)
  • RTP stack
  • Codecs
    • Audio
      • G.711
      • GSM
      • iLBC
      • Speex
      • G.729
      • G.722
      • G.722.2 (AMR-WB)
      • other audio codecs
    • Video
      • H.263
      • H.263+
      • H.264
  • User interface

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