Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
Verifying Your Configuration
You can check the validity of your voice-port configuration by performing the following tasks:
• Pick up the handset of an attached telephony device and listen for a dial tone.
• Check for DTMF detection if you have a dial tone. If the dial tone stops when you dial a digit, the
voice port is configured properly.
• Use the show voice port command to verify that the data configured is correct.
Troubleshooting Tips
If you are having trouble connecting a call and you suspect the problem is associated with the voice-port
configuration, you can try to resolve the problem by performing the following tasks:
• Ping the associated IP address to confirm connectivity. If you cannot ping your destination, refer to
the Network Protocols Configuration Guide, Part 1 for Cisco IOS Release 12.1T.
• Use the show voice port command to make sure that the port is enabled. If the port is offline, use
the no shutdown command.
• Make sure the VICs are correctly installed. For more information about installing a VIC in your
router, refer to the Cisco WAN Interface Cards Hardware Installation Guide.
Fine-Tune FXS and FXO Voice Ports
In most cases, the default values for voice-port tuning commands are sufficient. Depending on the
specifics of your particular network, you might need to adjust voice parameters involving timing, input
gain, and output attenuation for FXS or FXO voice ports. Collectively, these commands are referred to
as voice-port tuning commands.
If you need to change the default tuning configuration for FXS and FXO voice ports, use the following
commands beginning in privileged EXEC mode:
Step 9
music-threshold number Optional Specify the threshold (in dB) for on-hold
music. Valid entries are from –70 to –30
decibels (dB).
Step 10
description string Optional Attach descriptive text about this
voice-port connection.
Step 11
comfort-noise Optional If voice activity detection (VAD) is
activated, specify that background noise is
generated.
Command
Required or
Optional Task