1

Networks and telecommunications review

• Switched Telephone Network.
• Enterprise Telephone Service. Architecture. Assets (PABX, Terminals). Available services. Constraints and limitations.
• The Internet architecture, TCP / IP.
• Enterprise data network. Architecture.

2

Voice over IP

• Definition and concepts. The vocabulary of voip.
• Enterprise networks and their evolutions: Voice / Data separation, single network convergence. Why migrate to voip?
• How to integrate voip to enterprise information system?
• How to interoperate with traditional telephone networks?
• The user functionalities offered by voip.
• The market and its players.

3

Protocols essential (H323, SIP...)

• Roles and interests of each of the protocols.
• H323 Presentation and architecture. Principles and definitions. H323 components roles: gatekeeper, MCU, gateway... The s
• SIP Presentation and architecture. Principles and definitions. SIP components roles: proxy, registrar, redirector, locat
• Other VoIP protocols. MGCP, MEGACO, H248... IAX protocol, from Asterisk Open Source.

4

Migrating to Voice over IP

5

Integration and administration

• Manufacturers administration tools.
• Measures of QoS.
• Integration with users databases : LDAP, SSO.
• Use and update of network equipment : DHCP, TFTP, DNS...
• The mobile phone terminals (VoIP over WiFi, DECT, dual-mode terminal...).
• Links: xDSL, Ethernet, radio links, sizing.

6

Performance and quality of service of Voip networks

• Why data networks do not give reliability required by the transport of voice?
• The reliability reference: the PSTN.
• Strengths and weaknesses of data networks in terms of quality of service. Definition and concepts of the QoS Quality of
• To compensate the unreliability of IP networks, use of specific protocols: RTP and RTCP.
• Summary of flows in Voip. Signalling ( call setup). Media (voice, video...).
• How to bring the performance to IP networks. Strengthen bandwidth. QoS management tools for IP networks (802.1P/Q, RSVP,

7

Security

• The emerging issues related to the migration to Voip solutions. What should we protect, who, why can we be attacked?
• The known threats. Confidentiality: protecting the media flow and the signalling exchanges. Integrity: control and preve
• Identity spoofing. Fraud. The spam. The regulation: the legal obligations of security and brakes for technological devel
• The issue of emergency services.

8

The future

• Operators evolution: fixed / mobile convergence and abandonment of PSTN model for VoIP.
• The convergence of technologies: WiMax, MPLS...
• The new services and multimedia uses.
• IMS, IP Multimedia Subsystem, tomorrow, the multimedia network.