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In this section:

Table of Contents
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Use the Configure Trace and Media Packet Capture window to both configure Call Trace Filters and to initiate call traces to use in debugging policy and call routing issues. 
 

On the 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 opens. 

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1Configure Trace and Media Packet Capture Window
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Configure Trace and Media Packet Capture
Configure Trace and Media Packet Capture
 
 

There are two panels in this window: the Call Trace Status and Setting panel and the Call Trace Filters panel. The Call Trace Filters panel lists any existing Call Trace Filters.

Call Trace Filters define conditions that determine which call events trigger logging PES call trace messages to the system trace data event log. When a call meets the criteria, the trace information is written to a tracing file (.TRC). The following default information is collected during a call trace: 

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

Do not configure a Call Trace Filter to trace all calls. Use of the Call Trace feature can have significant impact on the network performance of the 

Spacevars
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system. 
Spacevars
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strongly recommends configuring Call Filters which result in a small number of calls being traced to avoid heavy loads. Also, be sure to delete Call Trace Filters once you have obtained the necessary information.

Call Trace Filters

Info
titleNote:

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

You must create Call Trace Filters before you can start a call trace.

 The Call Trace Filter object allows you to create and configure Call Trace Filters that specify criteria that the SBC uses to determine which call events to trace.

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To Create Call Filter
To Create Call Filter
To Create a Call Trace Filter

To create a new Call Trace Filter, click New Call Filter on the Call Trace Filters panel. The Create New Call Trace Filter window opens.

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1Create New Call Trace Filter Window
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Enter values for the Call Trace Filter object using the following table and click Save.

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1Call Trace Filter parameters
 

Parameter

Description

NameSpecifies the name of the Call Trace Filter of up to 23 characters.
State

Specifies the state of this filter. The options are:

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

Specifies the type of logs to capture while running a Call Trace. The options are:

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

The option "Also save CLI call details and statistics for traced calls (Call Detail Status, Call Media Status, Call Resource Detail Status)" is not supported.  

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 
Info
titleNote:

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

 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.
  • The Level 4 filters are based only on Peer IP address and this must be specified to trace calls. This call trace method does not trace/filter based on trunk group, called number, calling number, and so on.
  • 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.)


Capture calls that match these filters

Specifies the criteria to use determine which calls to capture in the logs in a Call Trace (these are optional). The options are:

Called number: Specifies the called party number to trace. Field length is up to 30 characters.

Calling number: Specifies the calling party number to trace. Field length is up to 30 characters.

Contractor number: Specifies the contractor number to trace. Field length is up to 30 characters.

Redirecting number: Specifies the redirecting number to trace. Field length is up to 30 characters.

CDDN number: Specifies the Called Directory Number to trace. Field length is up to 30 characters. 

NOTE: For the preceding options, the following characters are accepted by the SBC when specifying Call Trace Filter criteria: 

    • Digits 0-9

    • Plus (+) symbol 

Wildcard matching is also supported. Use "X" or "x" wildcard character to match any single digit, and "%" symbol to match any digits from that point forward.

For example, using "978xxx1212" returns all calls between 9780001212 and 9789991212, and using "978%" returns all calls with a 978 prefix. 

 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 filter the calls to trace. This string must match the trunk group name exactly. You cannot use wildcard characters for this argument. Field length is up to 23 characters.

Peer IP address: Specifies the peer IpV4 or IpV6 address for call tracing.

Stop Match

Specifies the condition to stop matching filters. 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)
Info
titleNote

As a general rule, set the Call Trace Filter for the ingress side except for the Called number. 

To Edit a Call Trace Filter

  1. Select an existing Call Trace Filter object by clicking the radio button adjacent to it in the Call Trace Filters window. The Edit Call Trace Filter window is displayed.

  2. Make changes and click Save.

To Copy a Call Trace Filter

  1. Select an existing Call Trace Filter object by clicking the radio button adjacent to it in the Call Trace Filters window.
  2. Click Copy Call Filter. The Copy Call Trace Filter window is displayed.
  3. Make changes and click Save. 

To Delete a Call Trace Filter

  1. Select an existing Call Trace Filter object by clicking the radio button adjacent to it in the Call Trace Filters window.
  2. Click the X on the right end of the selected row.

  3. Confirm the deletion when prompted.

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Call Trace Status and Settings
Call Trace Status and Settings
Call Trace Status and Settings

Once you have one or more Call Trace Filters created, call traces can be started and stopped from the top panel of the Configure Trace and Media Packet Capture window. See the earlier figure of the Configure Trace and Media Packet Capture window. There you can start, save and stop traces using the enabled filters. The trace continues running until a specified duration elapses or the specified number of call filter matches is reached.

Info
titleNote:

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

To Run a Call Trace

 In the Call Trace Status and Settings panel, choose the required conditions for the trace using the following table.

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1Call Trace Status and Settings parameters
3Call Trace Error Types
 

Parameter

Description

Call Trace Duration

Specifies the duration for the Call Trace to run. 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 180 minutes.
Number of Matches (optional)Specifies the maximum number of calls to match before stopping the trace. The value ranges from 1 to 64 times.
Trace Calls with errors of the type

Check this object to enable specifying  a system-wide call trace error filter trigger criteria. By default the option is unchecked which means there is no SIP PDU logging for this error filter. After checking the option the following options are available:  

  • 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).

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For further details on error logs, see the section Call Trace Log Messages.

Call Trace Status

Displays the current status of the Call Trace.

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

Click Save & Start Trace to start the trace. The trace status is displayed in the same panel.  

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1Call Trace Logs and Monitors - Call Trace Running
 

The trace stops automatically if a time limit is specified, otherwise you must stop the trace manually by clicking Stop Trace.

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1Call 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). For more details on log messages, see the section Call Trace Log Messages.

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Log Message Facts
Log Message Facts
Call Trace Log Messages

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Offline Call Trace Analysis Using LX Utility

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PageWithExcerptMedia Capture and Call Trace

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