Network Router User Manual

Cisco High-Density Analog Voice and Fax Network Module

Configuration Tasks

Cisco IOS Release 12.2(2)XT and 12.2(8)T

Verifying Analog Voice-Port Configurations

After configuring the voice ports on your router, perform the following steps to verify proper operation:

Step 1 Pick up the handset of an attached telephony device and check for a dial tone.

Step 2 If you have dial tone, check for DTMF detection. If the dial tone stops when you dial a digit, then the

voice port is most likely configured properly.

Step 3 To identify port numbers of voice interfaces installed in your router, use the show voice port summary

command. For examples of the output, see the “Analog FXS Voice Port Example” section on page 30.

Step 4 To verify voice-port parameter settings, use the show voice port command with the appropriate syntax

from Table 3. For sample output, see the “Analog FXO Voice Port Example” section on page 29.

Step 5 To display voice-channel configuration information for all DSP channels, use the show voice dsp

command.

Router# show voice dsp

Step 2

Router(config-voiceport)# output attenuation value

Specifies the amount of attenuation in decibels at

the transmit side of the interface, decreasing the

signal. A system-wide loss plan can be

implemented using the input gain and output

attenuation commands.

The default value for this command assumes that a

standard transmission loss plan is in effect,

meaning that normally there must be –6 dB

attenuation between phones.

The value argument is any integer from –6 to 14.

The default is 0.

Step 3

Router(config-voiceport)# impedance { 600r | complex1 }

Specifies the terminating impedance of a voice

port interface, which needs to match the

specifications from the specific telephony system

to which it is connected.

• 600r—Specifies 600 ohms real.

• complex1—Specifies Complex 1.

The default is 600r.

Command Purpose

Table 3 Show Analog Voice Port Command Syntax

Platform Command Syntax

Cisco 2600 series

Cisco 3640

Cisco 3660

show voice port [slot-number/subunit-number/port]