Specifications

Appendix B: Network IP Topology
Introduction
Page B-2 Mitel
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5000 Installation Manual – Issue 3.0, October 2008
Introduction
The Mitel CS-5200/5400/5600 platform utilizes network communications for several purposes
including administration, IP endpoints, IP trunks, and private networking. The Mitel CS-5200/
5400/5600 platform is limited to a single network connection shared among the different
functions. This appendix discusses the security and associated network topology issues for the
Mitel CS-5200/5400/5600 platform. Network suitability and associated performance for VoIP
traffic is beyond the scope of this appendix. For information on VoIP traffic guidelines, refer to
Inter-Tel’s VoIP Data Network Requirements, part number 835.2885.
Terminology
The following terminology appears in this appendix:
• ACL (Access Control List): An ACL is a list of filters (restrictions) applied to
communications passing through a router. Generally, each entry specifies a source, a
destination, and a port. The source and destination can be individual IP addresses or
subnets.
• DMZ (Demilitarized Zone): A DMZ is a subnet that is “between” an organization’s private
network and the Internet. Communication between nodes in a DMZ, the Internet, and the
internal network is controlled by a firewall. A DMZ provides some firewall protection for
nodes that need to be available to the Internet, while also protecting the internal network
from the DMZ nodes.
• Audio and Web Conferencing: AWC is an Mitel product that provides IP-based
conferencing capabilities to Mitel systems.
• Firewall: A firewall is a network device designed to provide limited connectivity between
an organization’s network and the Internet. A firewall generally prevents access from the
Internet to an inside network while allowing access from the inside network to the Internet.
Some firewalls also provide the capability for a special network, called a DMZ, that is
placed between the Internet and the internal network.
• Private Networking: This is the protocol used by the Mitel CS-5200/5400/5600 systems
to provide networking functionality.
• IPRA (Internet Protocol Resource Application): This is the function on the Mitel CS-5200/
5400/5600 system that provides IP connectivity to IP endpoints, trunk gateways, and
Private Networking.
• MGCP (Media Gateway Control Protocol): MGCP is a standard protocol for commanding
VoIP media gateways.
• NAT (Network Address Translation): A NAT is an Internet standard that enables a local-
area network (LAN) to map between one set of IP addresses for internal traffic and a
second set of addresses for external traffic.
• NAT IP Address: This is the public IP address that is statically mapped to the Mitel 5000
system IP address.
• Native IP Address: This is the IP address of the Mitel 5000 system network interface.
This is the Mitel 5000 system real IP address.
• OAI: (Open Application Interface): System OAI is a system-level communications protocol
that allows command-oriented tools to be developed for the phone system. System OAI is
available in two levels: Events and Third Party Call Control. System OAI Events provides
call status information to an external device. Its primary use is for automatic call
distribution products such as the Call Center Suite. System OAI Third Party Call Control is
a TSAPI protocol that allows system command-oriented tools to be used on the phone
system. Contact Mitel for more information regarding products and development materials
for these features.