Master Thesis - Past Projects - Abstract

Presence aware software using the Session Initiation Protocol

ID: LITH-IDA-EX--04/110

The Session Initiation Protocol (SIP) is a standardised Internet protocol used primarily to set up media sessions over IP network, such as video conferencing or telephony. This thesis investigates additions to this protocol that adds signalling functionality that can be used by Instant Messaging (IM) and other Presence aware applications. This provides the Im world with a much awaited standard protocol, but it also migrates the popular Presence feature from IM to any communication set up over an IP network. Today, that includes not only the Internet, but also telephony and television. With this technique, complex code for subscribing and notificating presence information is moved from the clients to the Presence Server, which makes it easier to create clients, but also provides with new features that are hard to implement in a traditional, fully distributed system. This thesis demonstrates how to implement a prototype SIP Presence server and different types of presence aware clients. The clients are described both as example implementations and in a more general taxonomy.

Keywords: SIP,Session Initiation Protocol,Presence,IM,client,server,subscribe,notify,event notification framework,IETF

Author(s): Henrik Leion

Contact: Simin Nadjm-Tehrani