Inter-Tel AXXESS Manual page 1532

Appendix F – Network Topology
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INTER-TEL AXXESS
1. INTRODUCTION
1.1
administration, Internet Protocol (IP) endpoints, IP Trunks, and Inter-Tel private networking.
The system can have one or more network connections shared among the different functions.
This appendix discusses the security and associated network topology issues for the system.
Network suitability (performance) for Voice over IP (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).
2. TERMINOLOGY
2.1
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Page F-2
MANUAL VERSION 11.0 – May 2008
The Axxess system utilizes network communications for several purposes including
The following terminology is used in this appendix:
ACL (Access Control List): An ACL is a list of filters (restrictions) applied to commu-
nications passing through a router. Generally, each entry specifies a source, a destina-
tion, and a port. The source and destination can be individual IP addresses or subnets.
CPC (Call Processing Card): A CPC is the card in an Axxess system that provides the
resources necessary for call processing activities. The CPC card contains its own Ether-
net port.
CPS (Call Processing Server): An external Microsoft Windows-based PC that runs call
processing in larger, processing-intensive applications. A CPS communicates with a
CPC through a dedicated Ethernet connection.
DMZ (Demilitarized Zone): A DMZ is a subnet that is "between" an organization's pri-
vate 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 pro-
tection for nodes that need to be available to the Internet, while also protecting the
internal network from the DMZ nodes.
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Enterprise Conferencing: Enterprise Conferencing is an Inter-Tel product that pro-
vides 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 net-
work 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 5000 Communication Server: This is a converged communications platform
that provides and Internet Protocol (IP) solution for small- and medium-sized business
environments.
Inter-Tel Private Networking: This is the protocol used by the systems to provide net-
working functionality.
IPRC (Internet Protocol Resource Card): This is a card for the Inter-Tel Axxess system
that provides IP connectivity to Inter-Tel IP endpoints, trunk gateways, Inter-Tel Private
Networking.
MGCP (Media Gateway Control Protocol): MGCP is a standard protocol for com-
manding 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.
Introduction