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Back to Troubleshooting - Call Trace Logs and Monitors

Back to Call Trace Logs and Monitors - Call Trace and Packet Capture

In this section:

Call Trace

The SBC supports logging PES call trace messages in the tracing files (.TRC). Trace information is used for debugging policy and routing of a call. Processing information such as pre-processing, applying services, routing, and post processing is logged. For identifying traces of a call, the call identifier is also logged in the .TRC file.

The default information collected during a call trace includes the following:

  • Service group configuration
  • DSP T.38 event information, if applicable
  • DSP channel statistics
  • DEBUG/SYS log information

The Call Trace Filter screen allows you to create and configure Call Trace Filters using criteria to determine call events that are added to the system trace data event log (which uses the .TRC file extension). The first three Call Trace filters are logged unless the Stop Match flag  is enabled (whereby the number of filters logged may be less than three). The Stop Match flag  stops filter profile matching once a match is found.

When a call trace filter is created, call trace is started, and a call fulfills the filter criteria, the trace information is written to a tracing file (.TRC). Call trace can be started and stopped from the Call Trace > Configure Trace and Media Packet Capture screen. The trace continues running until the specified duration or number of call filter matches is reached.

The Call Trace feature supports to:

  • Configure Call Trace, Call Filter, Match, and Error Filter options from a single screen.
  • View the status of a Call Trace.
  • Stop a Call Trace with a single command.
  • Run the Call Trace for unlimited duration.
  • Restart the Call Trace with a single click when a call trace gets stopped once the call filters reaches the threshold limit.
  • Delete any Call Filter.
  • Create and Edit Call Filter and Filter Match Criteria from a Single Tool.

Call Trace Filters

Only the Administrators, Field Service, Guests and Operators have the ability to access the Call Trace Configuration screen.

The Call Trace Filter object allows you to create and configure Call Trace Filters that specify criteria that the SBC uses to determine call events added to the system trace data event log (which uses the .TRC file extension).

Limitation: Call Trace should be set to ingress mode and not egress unless, egress mode is called for.

Navigation Path:

On the SBC main screen, navigate to Troubleshooting > Call Trace/Logs/Monitors > Call Trace and Packet Capture > Call Trace. The Configure Trace and Media Packet Capture window appears.

Call Trace Logs and Monitors - Call Trace Main Window

 

 

There are two panels for this window: Call Trace Status and Setting panel and Call Trace Filters panel.

You need to create Filters first or use the created Filters to start a Call Trace on it.

To View Call Filter

On the SBC main screen, navigate to Troubleshooting > Call Trace/Logs/Monitors > Call Trace and Packet Capture > Call Trace. The Configure Trace and Media Packet Capture window appears.The second panel reflects the Filter entries in it.

Call Trace Logs and Monitors - Call Trace Filters

 

To Create Call Filter

To create a new Call Filter, click New Call Filter tab on the Call Trace Filters panel.

Call Trace Logs and Monitors - Call Trace Filters Fields

 

The Create New Call Trace Filter window is displayed.

Call Trace Logs and Monitors - Call Trace Filters Create

 

The following fields are displayed:

Call Trace Filter parameters

 

Parameter

Description

NameSpecifies the name of the Call Trace filter that you are about to create.
State

Specifies the state of this filter. The options are:

  • Enabled: If enabled, this filter can be used for Call Trace.
  • Disabled (default): If disabled, it is not used for Call Trace.
Capture type

Specifies the type of logs that need to be captured while running the Call Trace. The options are:

  • TRC logs: Capture trace information (.trc logs) only.
  • TRC and PKT logs: Capture trace information (.trc logs) and media information (.pkt logs).

You can save the CLI call details and statistics by selecting this additional option, Also save CLI call details and statistics for traced calls (Call Detail Status, Call Media Status, Call Resource Detail Status). These files are saved as .out files.

Detail level to log

Specifies the level of details that need to be capture in the log file when the trace is complete. The options are:

  • Level 1 - Everything
  • Level 2 - Everything but raw hex dump.
  • Level 3 - Only external message information and errors.
  • Level 4 - Only SIP PDU events.

Level 4 Call Trace Filter conditions/behavior:

  • Level 4 traces all the SIP PDU events (without logging other trace messages) at line-rate without dropping any PDUs. These traces are used by SIP Ladder feature for further analysis.
  • Level 4 filters based ONLY on Peer IP Address. This call trace method does not trace/filter based on trunk group, called number, calling number, etc.
  • Configure a Level 4 filter with a wildcard Peer IP Address of 255.255.255.255 to match ALL packets to/from any IP address.
  • Level 4 filters identify GCID when possible. However, some messages do not contain GCIDs and may have 0xfffffffff as the GCID (registration, notify, options ping, and so on).
  • No other trace filters can be running at the same time as the level 4 trace (that is, do not run a level 1, 2, or 3 trace at the same time as the level 4 trace.)


The Level 4 log is implemented to capture SIP Ladder diagrams for the interpretation of calls.


Capture calls that match these filters

Specifies the criteria that need to be captured in the logs in a Call Trace (these are optional). The options are:

  • Called Number: Specifies the called party number to trace. An X or x means accept anything in that digit position. For example, 617xxx1212 would filter for all numbers 6170001212 through 6179991212. The % symbol acts as a wildcard for all remaining digits. For example, use 978% to trace all calls with a 978 prefix. Field Length is upto 30 characters.
  • Calling Number: Specifies the calling party number to trace. An X or x means accept anything in that digit position. For example, 617xxx1212 would filter for all numbers 6170001212 through 6179991212. The % symbol acts as a wildcard for all remaining digits. For example, use 978% to trace all calls with a 978 prefix. Field Length is upto 30 characters.

  • Contractor Number: Specifies the contractor number to trace. An X or x means accept anything in that digit position. For example, 617xxx1212 would filter for all numbers 6170001212 through 6179991212. The % symbol acts as a wildcard for all remaining digits. For example, use 978% to trace all calls with a 978 prefix. Field Length is upto 30 characters.

    For the above parameters, use "X" or "x" wildcard characters to match any single digit and "%" symbol to match any digits from that point forward.

  • Redirecting Number:  Specifies the redirecting number to trace. An X or x means accept anything in that digit position. For example, 617xxx1212 would filter for all numbers 6170001212 through 6179991212. The % symbol acts as a wildcard for all remaining digits. For example, use 978% to trace all calls with a 978 prefix. Field Length is upto 30 characters.
  • CDDN number: Specifies the Called Directory Number to trace. Field Length is upto 30 characters.

Transfer capability: Specifies the transfer capability of the call trace filter. Options are:

    • Audio31Khz - 3.1 kHz Audio - ITC 3.1 kHz audio calls are traced. The default setting is disabled.
    • Speech - ITC Speech based calls are traced. The default setting is disabled.
    • Unrestricted - Calls with ITC Unrestricted are traced. The default setting is disabled.
    • Unrestricted With Tones - Unrestricted Digital Information With Tones Announcements - Calls with ITC Unrestricted Digital Information With Tones Announcements are traced. The default setting is disabled.
    • video - Calls with ITC Video are traced. The default setting is disabled.
  • Trunk Group: The name of a trunk group to trace. This string must match the trunk group name exactly. You cannot use wildcard characters for this argument. Field Length is upto 23 characters.
  • Peer IP Address: Specifies the peer IpV4 or IpV6 Address for call tracing.
stop match

Specifies the criteria to stop the Call Trace. The options are:

  • When a match occurs in this filter, stop trying to match the other filters
  • Continue to try to match up to two other filters after a match is found in this filter (default)

To Edit Call Filter

To edit any of the Call Filter entries in the list, click the radio button next to the specific Call Filter entry.

Call Trace Logs and Monitors - Call Trace Filters Highlighted

 

The Edit Call Trace Filter window is displayed below.

Call Trace Logs and Monitors - Call Trace Filters Edit

 

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

To Copy Call Filter

To copy any of the created Call Filter entry and to make any minor changes, click the radio button next to the specific Call Filter to highlight the row.

Call Trace Logs and Monitors - Call Trace Filters Highlighted

 

Click Copy Call Filter tab on the Call Trace Filters panel.

Call Trace Logs and Monitors - Call Trace Filters Fields

 

The Copy Call Trace Filter window is displayed along with the field details which can be edited.

Call Trace Logs and Monitors - Call Trace Filters Copy

 

Make the required changes to the required fields and click Save to save the changes.

To Delete Call Trace

To delete any of the created Call Trace filters, click the radio button next to the specific Call Trace filter which you want to delete.

Call Trace Logs and Monitors - Call Trace Filters Highlighted

 

Click Delete at the end of the highlighted row. A delete confirmation message appears seeking your decision.

Call Trace Logs and Monitors - Call Trace Filters Delete Confirmation

 

Click Yes to remove the entry from the list.

Call Trace Status and Settings

Call Trace Status and Settings panel allows you to perform a Call Trace. It allows you to Start, Save and Stop the traces on the selected filters.

On SBC main screen, go to Troubleshooting > Call Trace/Logs/Monitors > Call Trace and Packet Capture > Call Trace. The Configure Trace and Media Packet Capture window appears. The First panel reflects the area to perform a Call Trace.

Call Trace Logs and Monitors - Call Trace Main Window

 

Before you start a Call Trace, let us examine the conditions and the required fields to execute a Call Trace. The following conditions appear on the Call Trace Status and Settings panel.

Call Trace Status and Settings parameters

 

Parameter

Description

Call Trace Duration

Specifies the duration for the Call Trace to run on the selected filter. The options are:

  • Run trace until stopped (by clicking the Stop Trace button): If selected, the trace will keep running till it is stopped manually (by clicking the Stop Trace button).
  • Stop trace after __ minutes: If selected, add the number of minutes for the Call Trace to run. The value ranges from 1 to 360 minutes and the default value is 360 minutes.
Number of Matches (optional)Specifies the number of times the Call Filter criteria should match before stopping the trace. The value ranges from 1 to 64 times.
Trace Calls with errors of the type

Use this object to specify the system-wide call trace error filter trigger criteria.

  • none (default)—No SIP PDU logging for this error filter.
  • Any—Log all SIP PDUs that meet the requirement of the Parse Error, Out of Dialog, and Early Attempt options below.
  • Parse Error—Log received SIP PDUs that fail parsing. If an error is detected by SIP signaling, the accompanying PDUs will not be associated with any dialog, including an existing dialog. Hence all in dialog and out of dialog PDUs are assigned to this category. If an error is detected at the front end pre-parser, the PDU is logged by this software and not forwarded to SIP signaling. This prevents an offending PDU from being logged by both the pre-parser and SIP signaling.
  • Out of Dialog—Log incoming syntactically correct SIP PDUs (except INVITE) that do not belong to an existing dialog.
  • Early Attempt—Logs incoming SIP PDUs that result in early termination of the call (by either the pre-parser or SIP signaling).

Note

The system-wide error filter triggers a call trace based on the selected type of error. If you select to trace calls with errors as well as define call filters to trace, the error filter runs in parallel with the call filters. Both may trigger producing a double-PDU output, one for the conditions matched in the call filter, and one for the detected error.

Call Trace Status

Displays the current status of the Call Trace.

  • When there are no trace running, the application states Call trace stopped with a red dot.
  • when a trace is running, the application states Call trace running with a green dot.

To Run Call Trace

Follow these simple steps to run a Call Trace on a selected filter:

  1. Create a Call Trace Filter with the required parameters and conditions mentioned. Refer to To Create Call Filter section to activate the required parameters.
  2. The newly created filters are displayed in the Call Trace Filter panel.
  3. In the Call Trace Status and Settings panel, choose the required conditions to run the trace. Refer to Call Trace Status and Settings to know more on the conditions.

  4. Click Save & Start Trace on the Call Trace Status and Settings panel to start the trace. The trace status is displayed in the same panel.

    When you start the trace, by default, the first three enabled filters in the table are used for the trace.

    Call Trace Logs and Monitors - Call Trace Running

     

  5. The trace stops automatically if the condition is enabled else you have to stop the trace manually by clicking Stop Trace.

    Call Trace Logs and Monitors - Call Trace Stop

     

Once the trace is complete, the logs are generated and stored at Log Management. Look for TRC and PKT log files (.trc and .pkt log files).

Offline Call Trace Analysis Using LX Utility

 

The Call Trace Filter

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