Specifications

Appendix C VoIP Configuration Examples
C-12
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
FXO Gateway to PSTN (PLAR Mode)
The following scenario shows an FXO gateway to PSTN connection in PLAR
mode.
In this scenario, 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
scenario, Catalyst 4224 SLC in Salt Lake City is connected directly to the PSTN
through an FXO interface.
Figure C-4 illustrates the topology of this scenario.
Figure C-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.
58514
[phone]
(801) . . . . . . .
Catalyst 4224 SJ
San Jose
Salt Lake City
Catalyst 4224 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
V V