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Configuring Voice over IP
Verify Configuration
You can check the validity of your dial-peer configuration by performing the following tasks:
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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:
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Configure Voice Ports
Voice ports on Cisco 7200 series routers, Cisco 7200 VXR routers, Cisco 7301 router, Cisco 7401ASR
routers, and Cisco 7500 series routers support three basic voice signaling types:
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In general, voice-port commands define the characteristics associated with a particular voice-port
signaling type. Under most circumstances, the default voice-port command values are adequate to
configure FXO and FXS ports to transport voice data over your existing IP network. Because of the
inherent complexities involved with PBX networks, E&M ports might need specific voice-port values
configured, depending on the specifications of the devices in your telephony network.
T1/E1 Digital Voice Port Adapter Installation and Configuration
4-22
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.
Ping the associated IP address to confirm connectivity.
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 that 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.
FXO—The Foreign Exchange Office interface allows a connection to be directed to the PSTN's
central office (or to a standard PBX interface, if the local telecommunications authority permits).
This interface is useful for off-premises extension applications.
FXS—The Foreign Exchange Station interface allows connection for basic telephone equipment,
key sets, and PBXs, and supplies ring, voltage, and dial tone.
E&M—The "Ear and Mouth" interface (or "RecEive and TransMit" interface) allows connection for
PBX trunk lines (tie lines). It is a signaling technique for two-wire and four-wire telephone and trunk
interfaces.
Chapter 4
Configuring the PA-VXA, PA-VXB, and PA-VXC
OL-3592-02
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Table of Contents
Troubleshooting
