
Chapter 2 Prerequisites checklist 29
IP Telephony Configuration Guide
Determining the published IP address
Use the flowchart in Figure 3 to determine which card should be set as the published IP address.
Figure 3 Setting the Published IP address
The flowchart shown in Figure 3 makes reference to public and private IP addresses. The public
and private IP addresses are concepts relating to Network Address Translation (NAT). The
decision also depends on whether a Virtual Private Network (VPN) is enabled. For information
about NAT and VPN, refer to the Business Communications Manager 2.5 Programming
Operations Guide.
If you use IP telephones on the network, they must be set to have the IP address of the network
card they are connected to for their Default Gateway, and the Published IP address as the S1 IP
address. For more information about this, see “Configuring the i2002 or i2004 telephone to the
system” on page 35.
Is NAT enabled?
Y
Are all of your public side
Do you anticipate the most VoIP
Is the Business Communications
Manager expected to connect to
devices on the public side?
Y
traffic on your public or private side?
Private
Public
Set the network interface on the
public side as the published
Set the network interface with
the most anticipated VoIP traffic
as the Published IP address
Set the network interface on the
private side as the published
IP address
Set the network interface on the
private side as the published
IP address
devices using a VPN?
N
N
N
Y
Set the network interface on the
public side as the published
IP address
IP address
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