An Introduction to H.323 Videoconferencing, June 2002, D. E. Price and A.J. Spence

Security Guide for H.323 Videoconferencing, Jan 2004, Tim Chown and Ben Juby

Request For Comments: 1918 “Address Allocation For Private Internets” Feb 1996, Y. Rekhter, B. Moskowitz, D. Karrenberg, G.J. de Groot, and E. Lear 

H.323 and Firewalls: Problem Statement and Solution Framework, Feb 2000, Melinda Shore (Expired Internet Draft) 

Packet-based Multimedia Communications Systems Telecommunication Standardization Sector of the International Telecommunications Union, Recommendation H.323, June 2006. 

A Case Study of Changes Made to a Nokia/Checkpoint Firewall-protected H.323 Gatekeeper/Proxy Topology, March 2007, G. Constable and T. Fullard 

Configuring an H.323 gatekeeper for use with the JANET Videoconferencing Service, Dec 2004, G. Constable