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Optimize Dial Peer and Network Interface Configurations
VC-32
Voice, Video, and Home Applications Configuration Guide
Validation Tips
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 the dial peer to which a particular number
(destination pattern) resolves.
Troubleshooting Tips
If you are having trouble connecting a call and you suspect the problem is associated with 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 Network Protocols Configuration Guide, Part 1.
• 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 both 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.
• 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.
Optimize Dial Peer and Network Interface Configurations
Depending on how you have configured your network interfaces, you might need to configure
additional VoIP dial-peer parameters. This section describes the following topics:
• Configure IP Precedence for Dial Peers
• Configure RSVP for Dial Peers
• Configure CODEC and VAD for Dial Peers
Configure IP Precedence for Dial Peers
If you want to give real-time voice traffic a higher priority than other network traffic, you can weight
the voice data traffic associated with a particular VoIP dial peer by using IP Precedence. IP
Precedence scales better than RSVP but provides no admission control.