Mitel Inter-Tel 5000, Руководство по установке и обслуживанию

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Appendix B: Network IP Topology
Private (Trusted) Networks
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Page B-7
Private (Trusted) Networks
With regard to the last bullet in “Topology Requirements” on page B-6 , all configurations require
that the Inter-Tel CS-5200/5400/5600 system, SIP Server, and IWAC are on the same network.
In the simplest form, all IP devices, including endpoints, are on the same network as shown in
the following illustration.
A Wide Area Network (WAN) provides the ability to connect two or more networks without
necessarily passing through a firewall/NAT. It essentially makes one larger private network. A
Virtual Private Network (VPN) uses public network facilities to provide private WAN connections.
In either implementation, there are no restrictions on topology as long as all IP devices are on
the same private network as shown the following illustration.
IMPORTANT
Although VPN links avoid the security and NAT addressing issues, the
encryption of VPN traffic sometimes introduces significant delays, making it
unsuitable for VoIP communications. This is a function of the network
connections and the networking equipment.
Internet
LAN
Remote or home
office Firewall/NAT
with VPN capabilities
LAN
Inter-Tel 5x00
Private IP Address(es)
DB Programming,
OAI Apps,
Diagnostics Monitor ,
System Monitor
Router/Firewall/NAT
Public
Interface
Private NAT
Interface
V
P
N
o
r W
A
N
UC/SIP Server
Enterprise
Conferencing
IP Endpoint
IP Endpoint
IP Endpoint
IP Endpoint
2
nd
Inter-Tel 5x00
Private IP Address(es)
This LAN, connected by a VPN
link, is effectively part of the
main LAN.
Note that IP endpoints and
Inter-Tel Private Networking
will not work outside the
firewall.