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Navigate the Call Flow tab

The Call Flow tab displays the Sequence and Topology diagrams detected in the PCAP files.

Feature

Description

1 - Show time difference

When selected, shows the time difference

2 - Show errors only

When selected, shows only the detected errors in the sequence.

3 - Filters (Advanced)

Use filters to view the sequence by protocols, message types, and/or messages.

4 - Visualization

Select to view the full procedure diagram or only specific procedures.

5 - Playback

Use playback to view the session step-by-step.

6 - View sequence diagram

Select to view the call flow as a sequence.

7 - View topology diagram

Select to view the call flow as a topology diagram.

8 - Download diagram

Choose to download in PNG or SVG format.

9 - Network elements

This area displays the chain of network elements that interacted during the call flow.

UE portions of the call flow:

  • The suffix “a” indicates originating

  • The suffix “b” indicates terminating.

For example, a voice-related call flow can contain any of the following combinations for a UE (User Equipment/smartphone):

  • UEa (originating side of the network)

  • UEb (terminating side of the network)

  • UEc (terminating side of the network, for Diversion scenarios)

Network Functions (PCSCF, SCSCF ,TAS, SCG, etc.):

  • The prefix 'o' (oPCSCF, ...) means Network Function on the originating side of the network

  • The prefix 't' (tPCSCF, ...) means Network Function on terminating side' of the network

  • Some Network Functions can end up with no prefix/suffix, such as:

    • SR

    • BGCF

    • MRFC

    • SBC

    • SSR
      All of the above default to 'originating side' of the network

10 - Sequence area

View the sequence here. You can magnify or reduce the diagram.

Filter your diagram

Use filters to view the sequence by protocols, message types, and/or messages.

Select the Advanced drop-down menu in the Call Flow tab.

Protocols filter

Select a protocol from the Protocols Filter to view specific protocols within the call flow sequence.

Message Types filter

Select a Message Type from the Message Types filter to filter messages by responses or requests.

Messages filter

Select one or multiple protocol messages. The Sequence Diagram will reflect your selections.

Note: The diagram will be blank if the selected messages are absent in the call flow.

Use the Call Flow Sequence Diagram

The Call Flow > Sequence Diagram displays the sequence of steps in the communication session from the packet capture and the protocols/ messages (requests and responses) for each step.

To use the Sequence Diagram:

  1. Select an analysis and open the Call Flow Details page from the High Level Summary.
    The Call Flow > Sequence Diagram displays by default.

  2. Use the drop-down list to choose your desired view. You can choose to view all of the procedures detected in the call or view individual procedures.

  3. Set your filters to view the desired parts of the sequence.

  4. View the messages from each subflow that transpired in the rows beneath each network element.

  5. Click the “i” to view a Network Element’s detailed information.

    The element's name and description is displayed.

Click the X to close the panel.

Subflow Message

The subflow messages are shown underneath the network elements. Each successful subflow message is aligned with its parent Network Element. Network errors are shown in red.

  1. Click the "i" to view the Element’s Detailed information.

    The Element’s Detailed Information will be displayed.

  2. Click Message Attributes to view the Element’s Detailed information.

Click the "X" to close the Message Attributes Information panel.

Watch the Call Flow Sequence

Click the play button to watch the call flow sequence. The call flow sequence will play the messages in order of occurrence, allowing you to identify the exact network elements and protocols.

Click the pause button to pause playback.

Click the back and forward buttons to jump to the beginning or end of the session.

Click the replay button to watch the flow again.

Click the X to stop playback and view the entire sequence again.

Use the Topology Diagram

The topology diagram chronologically displays the network domains and network messages detected in the PCAP. Use the diagram to pinpoint the precise source of issues at the network message level, isolate the root cause, and accelerate troubleshooting resolutions.

To use the Topology Diagram:

  1. Select the Topology icon to view the Topology Diagram.

  2. View the chain of network domains and elements.

    The network domains found in the call flow are displayed in the top row of the Topology diagram.
    The network elements are organized below their domains.

  3. Select the information icon to view detailed information.

➡️ Next: View the Protocol Level Analysis

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