Specifications

ix
Cisco 1751 Router Software Configuration Guide
OL-1070-01
FXO Gateway to PSTN (PLAR Mode)
The following example shows an FXO gateway to PSTN connection in PLAR mode.
In this example, PSTN users in Salt Lake City, Utah, can dial a local number and establish a private line
connection in a remote location. As in the previous example, Router SLC in Salt Lake City is connected
directly to the PSTN through an FXO interface.
Figure 4 illustrates the topology of this connection example.
Figure 4 FXO Gateway to PSTN (PLAR Mode) Example
Note This example assumes that the company has already established a working IP connection
between its two remote offices.
Router SJ Configuration
hostname router SJ
! Configure pots dial-peer 1
dial-peer voice 1 pots
destination-pattern 14085554000
port 0/0
! Configure voip dial-peer 2
dial-peer voice 2 voip
destination-pattern 1801.......
session target ipv4:172.16.65.182
ip precedence 5
! Configure the serial interface 0
interface serial1/0
clock rate 2000000
ip address 172.16.1.123 255.255.0.0
no shutdown
17416
1(408) 555-4000
1(801) . . . . . . .
Router SJ
San Jose
Salt Lake City
Router SLC
172.16.1.123
172.16.65.182
PSTN user
Voice port
0/0
PLAR connection
Voice port
0/0
PSTN
cloud
IP cloud