Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
Router SLC Configuration
hostname router SLC
!Configure pots dial-peer 3
dial-peer voice 3 pots
destination-pattern 1801555....
port 0/0
!Configure pots dial-peer 4
dial-peer voice 4 pots
destination-pattern 1801555....
port 0/1
!Configure voip dial-peer 1
dial-peer voice 1 voip
destination-pattern 1408555....
session target ipv4:172.16.1.123
ip precedence 5
!Configure the E&M interface
voice-port 0/0
signal immediate
operation 4-wire
type 2
voice-port 0/1
signal immediate
operation 4-wire
type 2
!Configure the serial interface 0
interface serial1/0
ip address 172.16.65.182 255.255.0.0
no shutdown
Note PBXs should be configured to pass all DTMF signals to the router. We recommend that
you do not configure, store, and forward tone.
Note If you change the gain or the telephony port, make sure that the telephony port still accepts
DTMF signals.
FXO Gateway to PSTN
FXO interfaces provide a gateway from the VoIP network to the analog PSTN or to a PBX that does not
support E&M signaling so that users can reach telephones and fax machines outside the VoIP network.
In this example, users connected to Router SJ in San Jose, California, can reach PSTN users in Salt Lake
City, Utah, via Router SLC. Router SLC in Salt Lake City is connected directly to the PSTN through
an FXO interface.
Figure 3 illustrates the topology of this connection example.