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PSTN Gateway Access Using FXO Connection

Configuring Voice over IP for Cisco MC3810 Series Concentrators 31

interface serial 0/0

description serial interface type dte

ip address 172.16.65.182

no shutdown

Note PBXs should be conﬁgured to pass all DTMF signals to the Cisco voice router. Cisco

recommends 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.

PSTN Gateway Access Using FXO Connection

The following example shows how to conﬁgure Voice over IP to link users with the PSTN gateway

using an FXO connection.

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.

Figure 3 PSTN Gateway Access Using FXO Connection Example

Note This example assumes that the company already has established a working IP connection

between its two remote ofﬁces.

Conﬁguration for Router SJ

! Configure pots dial peer 1

dial-peer voice 1 pots

destination-pattern +14085554000

port 1/0/0

! Configure voip dial peer 2

dial-peer voice 2 voip

destination-pattern 9...........

session target ipv4:172.16.65.182

S6617

1(408) 555-4000

Router SJ

San Jose Salt Lake City

Router SLC

172.16.1.123 172.16.65.182

PSTN user

Voice port

1/0/0

IP cloud

Voice port

1/0/0

PSTN

cloud

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