A hands on course covering IP telephony with SIP. The course starts with a brief review of knowledge students should already possess including RTP and RTCP. The main focus is on SIP though, progressing from what SIP is through SIP signalling, call processing and architectures, moving onto more advanced issues including security, multimedia, and interoperability. Hands-on practicals follow each major theory session.


Voice Over IP

Delegates will learn how to

By the end of the course delegates will be able to: Explain how SIP works. Analyse SIP packets. Deploy SIP IP telephony solutions. Integrate SIP with other telephony solutions.


VoIP review

What is VoIP? Brief review of IP, Brief review of telephones and voice. RTP, RTCP, mixers and translators.Hands on: Analysing RTP packets.

What is SIP?

Why SIP? SIP history, SIP standards, SIP capabilities, key services, how SIP works, and a basic SIP call.
Hands on: Peer to Peer SIP.

SIP messages

SIP sessions, SIP flows, Message structure, INVITE, ACK, BYE, CANCEL, OPTIONS, REGISTER. Extension methods. Response codes. SIP call flows.
Hands on: Analysing SIP packets.

SIP architectures

UA client, UA server, Proxy servers, Redirect servers, registrars. SIP phones, gateways, application servers, and other products. Stateful and stateless servers. Various call scenarios.
Hands on: SIP proxie

SIP addressing

URLs, SIP addresses, registration, Location and Directory servers. Address tracking.
Hands on: SIP and DNS

Supplementary services

SIP signalling, signalling compression, Call hold, Call forwarding, Home and away scenarios, transfers, conferences, call control.
Hands on: Analysing SIP supplementary services.


What is SDP? Multimedia, multimedia session announcement, invitation and others. Relationship with SIP.
Hands on: Video conferencing with SIP.

SIP security

Access control, Authentication, encryption, firewalls.
Hands on: SIP authentication.


Inter working with PSTN, ISUP to SIP mapping, SIP and 3G, SIP-T, SIP and SIGTRAN. SIP and H323.
Hands on: SIP and gateways.

SIP mobility

Terminal mobility, service mobility, personal mobility, Mobile IP, SIP signalling flows in 3G.