1. Rosenberg, J., et al.: SIP: Session Initiation Protocol. IETF RFC 3261 (June 2002)
2. Handley, M., Jacobson, V.: SDP: Session Description Protocol. IETF RFC 2327 (April 1998)
3. Mori, S., Kawarasaki, Y., Kataoka, H., Morita, N.: Priority Promotion Scheme (PPS) - An Autonomous and Distributed Admission Control for End-to-end Quality of Service for Interactive Multimedia Services, NTT Technical Review Online (October 2004), http://www.ntt.co.jp/tr/0410/special.html
4. Morita, N., Karlsson, G.: Framework of Priority Promotion Scheme. IETF Internet Draft draft-morita-tsvwg-pps-01 (October 2003)
5. Blake, S., et al.: An Architecture for Differentiated Services. IETF RFC 2475 (December 1998)