참고문헌
- Handley, et al., 'SIP: Session Initiation Protocol', RFC 2543, March 1999
- J. Rosenberg, et al., 'SIP Extensions for Instant Messaging', draft ietf sip message 00
- http://www.jabber.org
- http://www.imunified.org
- http://www.internetnews.com/ec-news/artic1e/0,,4_934201,00.html