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VoIP (Voice over IP) (? (Data evolution (Since 2001 more data transfer…

- - - - Routing telephone calls
  - - - Port 5060 UDP
      - Return codes HTTP protocol
      - URL sip:12324@sip.com
    - - User Agent (Client and Server)
        
        signaling and channel setup
      - SIP Proxy Server
      - SIP Redirect Server
      - SIP Registrar Server
        
        db of all users agents for a SIP domain (enable users to update info)
  - - - connects to a SIP provider to receive / placecalls to a PSTN
- - - - a-Law (Europe)
      - u-Law (USA & Japan)
    - - proprietary
      - reduces bandwidth usage