Nortel Networks NN10265-111 - Manual (Page 63)

MCS 5100 RTP Media Portal Basics
Copyright © Nortel Networks Limited 2006
Security and administration
How this chapter is organized
This chapter is organized as follows:
• Security overview on page 63
— Network level security functions on page 63
— RTP Media Portal component level security functions on
page 64
• User administration on page 65
Security overview
One function of the RTP Media Portal is to secure the media interface
to the MCP Services Network. Securing the media layer is achieved
through a combination of methods at the network level and the
component (RTP Media Portal) level.
Network level security functions
At the network level, media layer security is achieved by the
randomization of the IP addresses/ports used for multimedia sessions
and utilization of NAPT (Network Address Port Translation) technology
to obscure the network topology of the MCP Services Network.
Media Blade (IP address) randomization
When a multimedia session requests resources, the RTP Media Portal
selects an appropriate Media Blade to host the session. Media blade
selection determines the specific IP address that will be made available
to the media streams for the session.
During the selection of a Media Blade, the port usage of each Media
Blade is queried to determine the number of available ports for each.
The Media Blade which has the most available ports is selected. This
method of selection provides randomization and helps distribute the
session load across the Media Blades.