SOSIMPLEP2P Instant Messaging and

CommunicationDavid A. Bryan

November 25, 2003

Motivation

• Most current instant messenger and telecommunications protocols send all information through central server– Can purchase commercial IM servers, or use IM

protocols such as SIMPLE or Jabber. For communications, can use softswitch

• These still require a central proxy server

• Would be nice to have a system that requires no central server to communicate

• SIP/SIMPLE look like the ideal candidate

SIP/SIMPLE

• SIP (Session Initiation Protocol)– IETF standard for setting up communication

sessions• In practice, used for VoIP

• SIMPLE (SIP Instant Messaging and Presence Leveraging Extensions)– IETF standard using and based on SIP to

allow for sending of text instant messages– Along with Jabber, being proposed as an

open replacement for AIM, Yahoo, etc.

SIP/SIMPLE

• Both protocols use one or more central servers, called proxies, to control the signaling for a session, but media is streamed directly between nodes

• Servers primarily used for location management – it is possible to simply point two SIP/SIMPLE devices at each other and “talk”

• Self Organizing SIMPLE – SOSIMPLE

SIP/SIMPLE Call

Proxy

SOSIMPLE Call

P2P Namespace

Project Goal

• Evaluate possibility of implementing – explore problems– Message transmit problems? Where does it

require a proxy?– Security – joining w/someone else id?

• Evaluate candidates for software to modify

• Present structure and design to implement

• Possibly some initial implementation