Duration	2 days
Goal	Understanding properties and differences of VoIP compared to traditional telephony. Knowing the basics of the SIP protocol, and how various telephony services are being implemented based on that protocol.
Target audience	Persons interested in VoIP with a technical background, Network- and Systemadministrators
Prerequisites	Basic knowledge of networking protocols (TCP/IP, SMTP, HTTP)

The training conveys the theoretical basis of Voice over IP. An overview of traditional telephony technology helps understanding the differences of VoIP. The two industry-standard protocols "SIP" and "RTP" are being explained in detail. This includes protocol elements for telephony as well as extended functionality for typical PBX services and Instant Messaging / Presence.

• Traditional telephony (POTS, ISDN, SS7)
• VoIP (SIP, H.323, Jabber, IAX, proprietory protocols)
• SIP (User Agent, Proxy, Request/Response, Call Routing, standard SIP Scenarios, Session Description)
• SIP Authentication
• SIP Transport Protocols
• SIP transaction, SIP dialogues
• Interdomain Calls (SIP Trapezoid, Locating SIP Servers)
• SIP Back-2-Back User Agents
• SIP NAT Traversal (STUN, ICE ...)
• PSTN Interworking (Gateways, ISDN, MGCP)
• IPv4/IPv6 Interworking
• SIP Peering (authentication, routing, federation, ENUM, private ENUM)
• SIMPLE - Presence with SIP
• Fax over IP