Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
Verifying Your Configuration
You can check the validity of your dial peer configuration by performing the following tasks:
• If you have relatively few dial peers configured, you can use the show dial-peer voice command
to verify that the data configured is correct. Use this command to display a specific dial peer or to
display all configured dial peers.
• Use the show dialplan number command to show which dial peer is reached when a particular
number is dialed.
Troubleshooting Tips
If you are having trouble connecting a call and you suspect the problem is associated with the dial-peer
configuration, you can try to resolve the problem by performing the following tasks:
• Ping the associated IP address to confirm connectivity. If you cannot successfully ping your
destination, refer to the “Configuring IP” chapter in the Network Protocols Configuration Guide,
Part 1 for Cisco IOS Release 12.1T.
• Use the show dial-peer voice command to verify that the operational status of the dial peer is up.
• Use the show dialplan number command on the local and remote routers to verify that the data is
configured correctly on both.
• If you have configured number expansion, use the show num-exp command to check that the
partial number on the local router maps to the correct full E.164 telephone number on the remote
router.
• If you have configured a CODEC value, there can be a problem if the VoIP dial peers on either side
of the connection have incompatible CODEC values. Make sure that both VoIP peers have been
configured with the same CODEC value.
Caution If you are not familiar with Cisco IOS debug commands, you should read the “Using
Debug Commands” section in the “VoIP Debug Commands” chapter before attempting
any debugging.
• Use the debug vpm spi command to verify the output string the router dials is correct.
• Use the debug cch323 rtp command to check RTP packet transport.
• Use the debug cch323 h225 command to check the call setup.
Configure Voice Ports
Your router provides only analog voice ports for its implementation of VoIP. The type of signaling
associated with these analog voice ports depends on the voice interface card (VIC) installed in the
device.
Each VIC is specific to a particular signaling type; therefore, VICs determine the type of signaling for
the voice ports. Voice-port commands define the characteristics associated with a particular voice-port
signaling type.