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Linking PBX Users with E&M Trunk Lines

Configuring Voice over IP for Cisco MC3810 Series Concentrators 29

Conﬁguration Example

The actual Voice over IP conﬁguration procedure you complete depends on the actual topology of

your voice network. The following conﬁguration examples should give you a starting point. Of

course, these conﬁguration examples would need to be customized to reﬂect your network topology.

Conﬁguration examples are supplied for the following scenarios:

• Linking PBX Users with E&M Trunk Lines

• PSTN Gateway Access Using FXO Connection

• PSTN Gateway Access Using FXO Connection (PLAR Mode)

• Codec Preference Conﬁguration

These examples are described in the following sections. The following examples use the term

“router” to generically describe Cisco routers and concentrators.

Linking PBX Users with E&M Trunk Lines

The following example shows how to conﬁgure Voice over IP to link PBX users with E&M trunk

lines.

In this example, a company wants to connect two ofﬁces: one in San Jose, California and the other

in Salt Lake City, Utah. Each ofﬁce has an internal telephone network using PBX, connected to the

voicenetwork by an E&M interface.Both the Salt Lake City and the San Jose ofﬁcesare using E&M

Port Type II, with four-wire operation and ImmediateStart signaling. Each E&M interface connects

to the router using two voice interface connections. Users in San Jose dial “8-569” and then the

extension number to reach a destination in Salt Lake City. Users in Salt Lake City dial “4-527” and

then the extension number to reach a destination in San Jose.

Figure 2 illustrates the topology of this connection example.

Figure 2 Linking PBX Users with E&M Trunk Lines Example

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

between its two remote ofﬁces.

Conﬁguration for Router SJ

hostname sanjose

S6616

Dial peer

1 POTS

Router SJ

San Jose

(408)

Salt Lake City

(801)

Router SLC

Dial peer

2 POTS

PBX PBX

172.16.1.123

172.16.65.182

Voice port

1/0/0

Dial peer

1 POTS

Voice port

1/0/0

Voice port

1/0/1

Dial peer

2 POTS

Voice port

1/0/1

IP cloud

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