A voice engineer is troubleshooting an issue that involves incoming calls to POTS lines. Which command verifies the digits that are received by voiceport?
A. debug voip dial-per
B. debug vtsp session
C. debug vtsp dsp
D. debug call treatment
E. debug voice protocol
Answer is C
Verify Digits Received and Sent (POTS Call-Leg)
Once the on-hook and off-hook signaling are verified and work correctly, verify the correct digits are received or sent on the voice-port (digital or analog). A dial-peer is not matched or the switch (CO or PBX) is not able to ring the correct station if incomplete or incorrect digits are sent or received. Some commands that can be used to verify the digits received/sent are:
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 on how each network indication and application request is processed, signaling indications, and DSP control messages.
debug vtsp dsp —Earlier than Cisco IOS Software Release 12.3, this command displays the digits as they are received by the voice-port. However, in Cisco IOS Software Release 12.3 and later, the output of the debug command no longer displays the digits. The combination of debug hpi detail and debug hpi notification can be used to see the incoming digits.
debug vtsp all —This command enables these debug voice telephony service provider (VTSP) commands: debug vtsp session, debug vtsp error , and debug vtsp dsp.
For more information, refer to VoIP Debug Commands.
Extract from:
https://www.cisco.com/c/en/us/support/docs/voice/h323/14081-voip-debugcalls.html#debugvtspdsp
I agree with you :
C. debug vtsp dsp