Introduction; Terminology - Mitel Inter-Tel 5000 Installation And Maintenance Manual

Appendix B: Network IP Topology

Introduction

Introduction
The Inter-Tel CS-5200/5400/5600 platform utilizes network communications for several
purposes including administration, IP endpoints, IP trunks, and Inter-Tel private networking. The
Inter-Tel 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 Inter-Tel 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 no. 835.2885.

Terminology

The following terminology appears in this appendix:
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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.
Inter-Tel Audio and Web Conferencing: IAWC is an Inter-Tel product that provides IP-
based conferencing capabilities to Inter-Tel 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.
Inter-Tel Private Networking: This is the protocol used by the Inter-Tel CS-5200/5400/
5600 systems to provide networking functionality.
IPRA (Internet Protocol Resource Application): This is the function on the Inter-Tel CS-
5200/5400/5600 system that provides IP connectivity to Inter-Tel IP endpoints, trunk
gateways, and Inter-Tel 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 Inter-Tel
5000 system IP address.
Native IP Address: This is the IP address of the Inter-Tel 5000 system network interface.
This is the Inter-Tel 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 Inter-Tel for more information regarding products and development
materials for these features.
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Inter-Tel 5000 Installation Manual – Issue 2.4, May 2008