Related Information - Cisco 2800 Series Manual

IP Communication Solution for Group Applications Configuration Example
The following specific commands related to troubleshooting VoIP calls:
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For additional information about Cisco CallManager Express, go to:
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For additional information about Cisco Unity Express, go to:
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show dialplan number—This command is used to show which dial peer is reached when a
particular telephone number is dialed.
debug vtsp session—This command displays information to help you trace how the router interacts
with the DSP based on the signalling indications from the signalling stack and requests from the
application.
debug vtsp dsp—This command displays the digits as they are received by the voice port.
debug vtsp all—This command enables the following debug voice telephony service provider
(VTSP) commands: debug vtsp session, debug vtsp error, and debug vtsp dsp.
debug vpm signal—This command collects debug information only for signaling events. This
command can also be useful in resolving problems with signaling to a PBX.
debug voip ccapi—This command traces the execution path through the call control application
programming interface (API),, which serves as the interface between the call session application and
the underlying network-specific software. You can use the output from this command to understand
how calls are being handled by the router.
debug vpm port—This command is to limit the debug output to a particular port. The debug output
can be quite voluminous for a single port. A six-port chassis might create problems. Use this debug
command with any or all of the other debug modes
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