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Configure Voice Ports
Troubleshooting Tips
Configure Voice Ports
Catalyst 4224 Access Gateway Switch Software Configuration Guide
6-22
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" section in
the Network Protocols Configuration Guide, Part 1 for Cisco IOS Release
12.0 T.
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.
Use the debug vpm spi command to verify that the router dials the correct
•
output string.
Use the debug cch323 rtp command to check RTP packet transport.
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Use the debug cch323 h225 command to check the call setup.
•
Routers provide only analog voice ports for its implementation of VoIP. The type
of signaling associated with 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.
The voice ports support three basic voice signaling types:
FXS—The foreign exchange station interface uses a standard RJ-11 modular
•
telephone cable to connect directly to a standard telephone, fax machine,
PBX or similar device. FXS supplies ring, voltage, and dial tone to the
station.
Chapter 6
Configuring VoIP
OL-2031-02
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Troubleshooting
