Overview
This guide will provide you with steps to perform a dial-peer level debug on a Cisco IOS router or Cisco Unified Border Element (CUBE). Furthermore, we aim to help you understand the output of this debug to assist with troubleshooting VoIP calls in a Cisco UC environment.
This process is typically used troubleshoot inbound & outbound call failure. By using a dial-peer debug, we will confirm which dial-peers are being used for the inbound & outbound leg of the call.
Recommendations
Although not required, we recommend downloading the following software to make troubleshooting easier:
- NotePad++
- This program makes it easy to search, find, replace, and highlight specific words/phrases
- PuTTY or SecureCRT
- These programs allow us to SSH into the Cisco CUBE
Instructions
Please follow the steps below to perform a dial-peer level debug on a Cisco CUBE.
- Log into the Cisco CUBE
- Enter the following commands to enable the dial-peer debug:
clear log
debug voip ccapi inout
terminal monitor
- Place a test call to recreate the scenario we are troubleshooting.
- Enter the following command to view the log:
show log
- Enter the following commands to disable the dial-peer debug:
un all
term no mon
- Copy/paste the debugs into NotePad++ or Notepad
- Search for the Calling or Called number
- We typically use CTRL+F then highlight all occurrences of that number to make it easier to see
- Highlight all occurrences of the calling & called numbers
- Search for Incoming Dial-peer and Outgoing Dial-Peer
- Highlight all occurrences
- Navigate to the first instance of your calling number
- Find the first occurrence of the calling number
- Inspect the associated debug message and find the “incoming dial-peer” section
The below debug message will show the Calling and Called numbers as they come into the Cisco router, prior to any number modifications.
The below debug message repeats the Calling & Called numbers, and will tell us which Incoming dial-peer is matched. In this scenario the incoming call matched dial-peer 4000.
The below debug message repeats the Calling & Called numbers, and will tell us which Outgoing dial-peer is matched. In this scenario the outgoing call matched dial-peer 3000.
Reference
The below website provides additional instructions and guidance for troubleshooting VoIP calls.
Below is a link to Cisco’s Troubleshooting TechNote for “Troubleshoot and Debug VoIP Calls”.
https://www.cisco.com/c/en/us/support/docs/voice/h323/14081-voip-debugcalls.html
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