The Updated VoIP Solution Using FXO Modules
Internet
Router
3524 Switch
Network
Printer
Server
Server
IP Phone
Connecting the Single Site
Back to the Corporate System
Instead of using either a PRI or the aforementioned network module slot for the
analog lines for connection to public telephone services, some sites connect back
to their head office, or its main network by way of a frame relay network.This
type of circuit provides dedicated connectivity for the small site to gain access to
the head office’s resources, such as a mail server, or for consolidated access to the
public Internet.
This type of connection provides a number of benefits, including more stability
and independence over the telco providers, flexibility over the routing of
data and voice, and reduced cost. Even with the cost of the frame relay circuit,
the majority of corporate phone calls are inter-office and could use the frame
relay circuit between the small site and the corporate network. But, connections
like this mean that the small office must take its Internet connection from the
www.syngress.com
Figure 10.4 The Updated VoIP Solution Using FXO Modules
Internet
Router
3524 Switch
Network
Printer
Server
Server
IP Phone
IP Phone
VLAN
Routing
Voice VLAN
Data VLAN
Telco
PBX
NM-2V
0 1 0 1
0 1
344 Chapter 10 • Designing and Implementing Single Site Solutions
head office unless the small site has its own cost-effective Internet solution, like
that shown in Figure 10.5