724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 15
Chapter 3: Installation
Example 2
In this scenario, the Hybrid PBX and VoIP Gateway WAN port is directly connected to a switch provided by the Internet ISP. Traffic
from the SIP phones (green line) reaches the Hybrid PBX and VoIP Gateway on its LAN port and is then sent to the VoIP provider
via the WAN port. One advantage of this setup is that the WAN port gets a public IP address on the Internet. This makes it easy
to configure VoIP support and provide access for remote phone, as port forwarding does not have to be configured on the
Gateway/Router as in scenario 1.
ISP’s Router/
Switch
VoIP
Provider
Internet
Broadband
modem
Public Switched
Telephone
Network (PSTN)
Computers
SIP phones
DHCP server for
192.168.1.0/24
DHCP Gateway
and DHS server set
to 192.168.1.1
Hybrid PBX and
VoIP Gateway
(IPBX424)
192.168.1.1
LAN port 1
192.168.1.2
All devices are on
the same subnet
192.168.1.0/24
Gateway/Router
DHCP server is off
WAN port with static
public IP address
Managed
switch with
PoE support
Figure 3-2. Example 2.
As in Example 1, the Hybrid PBX and VoIP Gateway acts as the DHCP for the network, allowing it to automatically provision the
SIP phones. However, to support Internet access (yellow line), it assigns the gateway/router as the DNS server and default gateway
for all network devices.
(If your existing DHCP server supports Option 66, you can continue to use it if you make configuration adjustments. For details,
see Configuring a third-party DHCP server in the Networking chapter in the Hybrid PBX and VoIP Gateway Administrator’s Guide.)
Other installation examples
For other installation scenarios, see the Hybrid PBX and VoIP Gateway Administrator’s Guide.