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Overview

LX give you the ability to analyze and debug SIP and ISDN call flows.

Basic Call Search

Click Search on the menu bar, or hold down CTRL+Shift+S to access the Basic Call Search feature. The following figure displays the Basic Call Search dialog box:

Figure : LX Search

 

Table : Basic Search Menu

 
FieldDescription

Regex Called/Calling #

Use regular expressions to search for called/calling number patterns. For example, if one call leg used 4-digit numbering plan and another uses E.164 numbering plan, the destination number in one of the call legs could be 2474 and +15105742474 in the other call leg. Therefore, a regular expression of (.2474) will find the calls that contain the 2474 pattern in the called and/or calling numbers.

Called #

Use exact match for called number.

Calling #

Use exact match for calling number.

Call-ID / Machine-ID

Use SIP Call-ID or ISDN Machine-ID

Req/Resp

Use this to find all SIP requests or response. This is useful when you are searching for a specific response, for example 504 Server Time-out.

Advanced Call Search

Click Search on the menu bar, or hold down CTRL+Shift+A to access the Advanced Call Search feature. The following figure displays the Advanced Call Search dialog box:

Figure : Advanced Call Search

 

Table : Advanced Search Menu

 
FieldDescription

Method

Searches the method used to send and/or receive messages.

Regex - Text Search

Searches all fields and values occurring anywhere in a log file for specified text.

After typing a REGEX pattern, use the tab key or click elsewhere for the search to be triggered.

Peer IP

Searches for a specific Peer IP Address used for signaling tracing.

Peer Port

Searches for the port used for a specific peer IP address.

SBC IP

Searches for the name of the individual SBC Core server or the local host name.

SBC PortSearches for the port for the SBC Core server.

Calling #

Searches for a specific calling number.

Called #

Searches for a specific called number.

Call-ID

Searches for a SIP Call-ID or ISDN Machine-ID

Double-clicking on an entry opens the Call Flow for that whole search. However, if you only want the information a specific message, check the Open Message Only box before clicking on an entry.

Regex Number Call Search

Perform a regex search by selecting Number Regex Search under Search, or hold down CTRL+R to use LX - Called/Calling Number Regex Search feature. The following figure displays the LX - Called/Calling Number Regex Search dialog box:

Figure : Call Number Regex Search

 

View a Call Flow

When LX parses the log, it shows the calls placed in the Calls tab in the Lower Display Pane.

Figure : Calls Lower Display Pane

 

To view the Call Flow for a call

  1. Under the Calls tab, double-click anywhere in the row for the call you want to analyze.

    Double-clicking on an entry under the Calls tab displays only one leg of the call.

       
    A Call Flow dialog opens with the contents of the call.

    Figure : Call Flow

     

        

  2. Click on a message in the Call Flow Pane to view its contents in the Message Contents Pane.

    In this example, the INVITE message in the call flow has been selected and its contents are displayed in the Message Contents Pane on the right side of the dialog.

View an End to End Call Flow

Unlike the Calls tab, when an entry in the End to End Calls tab is double-clicked, both the ingress and egress of a call is shown in the Call Flow Pane. The End to End Calls feature uses Group Call ID and SIP PDU to identify and tie together all legs of a call.

To view the Call Flow for End to End Calls

  1. Under the End to End Calls tab, double-click anywhere in the row for the call you want to analyze.

    A Call Flow dialog opens with the contents of the Call Flow.

    Figure : End to End Call Flow

     

        

  2. Click on a message in the Call Flow Pane to view its contents in the Message Contents Pane.

View Multiple Calls in the Call Flow Ladder

Follow this procedure to display multiple call in the call flow ladder.

  1. Under the Calls tab or End to End Calls tab, hold down CTRL and click the call rows you want to view.

         

  2. Press Enter.

     

    All messages associated with the selected calls are displayed in a new dialog box.

    Figure : Multiple Call Flows

     

     

     

Log Segment Viewer

The Log Segment Viewer can be used to understand what is going on before and after a particular message in the call flow ladder.

To open the Log Segment Viewer

  1. In the Call Flow dialog box, double-click on any method in Call Flow Pane (left pane).

    A configurable subset of the log file opens where that message occurs.

Figure : Log Chunk View

 

Generate Call Ladder

Generate Call Ladder exports the call flow into a preformatted call ladder view for SIP and ISDN. The call ladder feature supports INVITE based flows and non-INVITE based flows. 

To generate a call ladder

  1. From the main window, double-click on a call log.

  2. In the Call Flow for Machine ID screen, click Generate Call Ladder.

    Figure : Call Ladder

     

Save the call ladder by clicking the Save Call Ladder button.

To generate a call ladder with only IP address

  1. Click Settings

  2. Under Call Flow, click Call Flow by IP Only

  3. From the main window, double-click on a call log.

  4. In the Call Flow for Machine ID screen, click Generate Call Ladder.

    Figure : Call Flow IP Only

     

Save the call ladder by clicking the Save Call Ladder button.

Export Call Flow

Export Call Flow exports the entire call flow into a preformatted view with additional details such as peer IPs and call-IDs.

To export call flow

  1. From the main window, double-click on a call log.

  2. In the Call Flow for Machine ID screen, click Export Call Flow.

    Figure : Export Call

     

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