Cisco MC3810-APM-FXO= Datasheet download pdf (Page 2)

Configuring Voice Ports

Voice Port Configuration Overview

VC-36

Cisco IOS Voice, Video, and Fax Configuration Guide

Voice Port Configuration Overview

Voice ports on routers and access servers emulate physical telephony switch connections so that voice

calls and their associated signaling can be transferred intact between a packet network and a

circuit-switched network or device.

For a voice call to occur, certain information must be passed between the telephony devices at either end

of the call, such as the devices’ on-hook status, the line’s availability, and whether an incoming call is

trying to reach a device. This information is referred to as signaling, and to process it properly, the

devices at both ends of the call segment (that is, those directly connected to each other) must use the

same type of signaling.

The devices in the packet network must be configured to convey signaling information in a way that the

circuit-switched network can understand. They must also be able to understand signaling information

received from the circuit-switched network. This is accomplished by installing appropriate voice

hardware in the router or access server and by configuring the voice ports that connect to telephony

devices or the circuit-switched network.

The illustrations below show examples of voice port usage.

• In Figure 10, one voice port connects a telephone to the wide-area network (WAN) through the

router.

• In Figure 11, one voice port connects to the PSTN and another to a telephone; the router acts like a

small PBX.

• Figure 12 shows how two PBXs can be connected over a WAN to provide toll bypass.

Figure 10 Telephone to WAN

Figure 11 Telephone to PSTN

Figure 12 PBX-to-PBX over a WAN

Voice port

1/0/0

Serial or

Ethernet port

WAN

37754

Voice port

1/0/0

Voice port

0/0/1

PSTN

37755

Voice port

1/0/0

PBX PBX

Serial or

Ethernet port

Serial or

Ethernet port

Voice port

1/0/0

WAN

37756

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