Cisco MC3810-APM-FXO= Datasheet download pdf (Page 13)

Configuring Voice Ports

Analog Voice Ports Configuration Task List

VC-47

Cisco IOS Voice, Video, and Fax Configuration Guide

In addition to the basic voice port parameters described in this section, there are commands that allow

voice port configurations to be fine tuned. In most cases, the default values for fine-tuning commands

are sufficient for establishing FXO and FXS voice port configurations. E&M voice ports are more likely

to require some configuration. If it is necessary to change some of the voice port values to improve voice

quality or to match parameters on proprietary PBXs to which you are connecting, use the commands in

the current section and also in the “Fine-Tuning Analog and Digital Voice Ports” section on page 78.

After the voice-port has been configured, make sure that the ports are operational by following the steps

described in the following sections:

• Verifying Analog and Digital Voice-Port Configurations, page 97

• Troubleshooting Analog and Digital Voice Port Configurations, page 108

For more information on these and other voice port commands, see the Cisco IOS Voice, Video, and Fax

Command Reference.

Note The commands, keywords, and arguments that you are able to use may differ slightly from those

presented here, based on your platform, Cisco IOS release, and configuration. When in doubt, use

Cisco IOS command help (command ?) to determine the syntax choices that are available.

To configure basic analog voice port parameters on Cisco 1750, Cisco 2600 series, Cisco 3600 series,

and Cisco MC3810 routers, use the following commands beginning in global configuration mode:

Command Purpose

Step 1

Cisco 1750 and MC3810

Router(config)# voice-port

slot

port

Cisco 2600 and 3600 series

Router(config)# voice-port

slot

subunit/port

Enters voice-port configuration mode.

The arguments are as follows:

• slot—Specifies the number of the router slot

where the voice network module is installed

(Cisco 2600 and Cisco 3600 series routers) or

the router slot number where the analog voice

module is installed (Cisco MC3810

multiservice concentrator).

• port—Indicates the voice port. Valid entries

are 0 or 1.

• subunit—Specifies the location of the VIC.

Note The slash must be entered between slot

and port.

Valid entries vary by router platform; see Table 7

on page 42 or enter the show voice port

summary command for available values.

Step 2

FXO or FXS

Router(config-voiceport)# signal {loop-start |

ground-start}

Selects the access signaling type to match that of

the telephony connection you are making. The

keywords are as follows:

• loop-start—(default) Uses a closed circuit to

indicate off-hook status; used for residential

loops.

• ground-start—Uses ground and current

detectors; preferred for PBXs and trunks.

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