Configuring
Figure 18 FXO Gateway to PSTN
| FXS VIC |
Source | 0/0 |
| |
| IP cloud |
| West |
| FXO VIC |
Destination | 1/0 |
|
PSTNport 0/0 cloud
51077
To create a POTS dial peer for an FXS interface as explained earlier, you enter the complete telephone number of the attached telephone as the destination pattern for incoming calls. However, to create a POTS dial peer for an FXO interface, the destination pattern refers to outgoing calls, and you can include wildcards in it because the PSTN performs the switching.
The VoIP feature can also remove digits that you do not want to send to the PSTN. For instance, to dial
9 to reach an outside line (that is, the analog PSTN), enter the following commands:
West> enable
Password:
West# configure terminal
West(config)#
When you dial 9, the router makes a connection to the PSTN through voice port 0/0. The PSTN then provides a dial tone, and any digits you enter on the telephone thereafter are interpreted on the PSTN.
To enable East router users to make calls over the West router local PSTN, enter the following commands:
East(config)# | voice 701 voip |
session target ipv4:192.168.19.27 | |
West(config)# | voice 601 pots |
port 0/0 |
When you dial 7 on the East router, the call is connected to the PSTN on the West router. The PSTN then provides a dial tone, and any digits you enter on the telephone thereafter are interpreted on the PSTN.
Note In this example, West router voice port 0/0 has two separate POTS dial peers associated with it. Dial peer 201 matches calls beginning with the digit 9 and handles PSTN calls originating from the West router. Dial peer 601 matches calls beginning with the digit 7 and handles calls to the PSTN originating from the East router.
Cisco 1751
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