Cisco MC3810-APM-FXO= Datasheet download pdf (Page 3)

Configuring Voice Ports

Voice Port Configuration Overview

VC-37

Cisco IOS Voice, Video, and Fax Configuration Guide

Cisco provides a variety of Cisco IOS commands for flexibility in programming voice ports to match the

physical attributes of the voice connections that are being made. Some of these connections are made

using analog means of transmission, while others use digital transmission. Table 4 shows the analog and

digital voice-port connection support of the router platforms discussed in this chapter.

Telephony Signaling Interfaces

Voice ports on routers and access servers physically connect the router or access server to telephony

devices such as telephones, fax machines, PBXs, and PSTN central office (CO) switches. These devices

may use any of several types of signaling interfaces to generate information about on-hook status,

ringing, and line seizure.

The router’s voice-port hardware and software need to be configured to transmit and receive the same

type of signaling being used by the device with which they are interfacing so that calls can be exchanged

smoothly between the packet network and the circuit-switched network.

The signaling interfaces discussed in this chapter include foreign exchange office (FXO), foreign

exchange station (FXS), and receive and transmit (E&M), which are types of analog interfaces. Some

digital connections emulate FXO, FXS, and E&M interfaces, and they are discussed in the second half

of this chapter. It is important to know which signaling method the telephony side of the connection is

using, and to match the router configuration and voice interface hardware to that signaling method.

The next three illustrations show how the different signaling interfaces are associated with different uses

of voice ports. In Figure 13, FXS signaling is used for end-user telephony equipment, such as a

telephone or fax machine. Figure 14 shows an FXS connection to a telephone and an FXO connection

to the PSTN at the far side of a WAN; this might be a telephone at a local office going over a WAN to a

router at headquarters that connects to the PSTN. In Figure 15, two PBXs are connected across a WAN

by E&M interfaces. This illustrates the path over a WAN between two geographically separated offices

in the same company.

Table 4 Analog and Digital Voice-port Support on Cisco Routers and Access Servers

Platform Analog Digital

Cisco 803 and 804 Yes No

Cisco 1750 Yes No

Cisco 2600 series Yes Yes

Cisco 3600 series Yes Yes

Cisco MC3810 Yes Yes

Cisco AS5300 No Yes

Cisco AS5800 No Yes

Cisco 7200 series No Yes

Cisco 7500 series No Yes

1 2 3 4 ... 82

No comments

Cisco MC3810-APM-FXO= Datasheet Page 3