> ## Documentation Index
> Fetch the complete documentation index at: https://docs.poly.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# 02.2025

> February 2025 release notes.

The **February 2025** PolyAI Agent Studio release introduces new tools for Knowledge versioning, function latency control, and improved conversation review.

Expand the items for details:

<AccordionGroup>
  <Accordion title="View Knowledge differences between versions" icon="book-open" id="view-knowledge-base-differences-between-versions">
    You can now use the [Environments & versions](/environments-and-versions/diffs) tab to compare two [Knowledge](/managed-topics/introduction) versions
    side-by-side and track modifications across the **sandbox, pre-release, and live** environments.

    Versions are displayed as **split diffs**.

    * **<Icon icon="plus" iconType="solid" color="#2D8C66" /> Additions** mean a new Knowledge entry.

    * **<Icon icon="minus" iconType="solid" color="#D64F4F" /> Deletions** means a Knowledge entry has been deleted.

    * **<Icon icon="rotate" iconType="solid" color="#3B73D1" /> Edits** is the symbol applied to any existing but altered Knowledge entry.

          <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/kb-diff.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=e2edacf6a41f490004cbeb4e5a63e7ae" alt="kb-diff" width="3022" height="1638" data-path="images/release-notes/2502/kb-diff.png" />

    * Quickly identify additions, deletions, and changes between Knowledge versions.

    * Easily attribute changes to their authors.

    Visit the [Environments & versions](/environments-and-versions/diffs) page for more details.
  </Accordion>

  <Accordion title="Manage function latency" icon="wifi" id="function-latency-control">
    Improve the experience for users when a function takes longer than expected by playing filler utterances during the delay.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/latency-control.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=ed2e549b59946b2b91663531a851f36f" alt="latency-control" width="3024" height="1486" data-path="images/release-notes/2502/latency-control.png" />

    **How it works:**

    * Set up **delay responses** that play while a function is still processing.
    * Define the **initial delay** before the first filler utterance is played.
    * Configure the **interval** between utterances to control pacing.
    * Specify the **expected length** of each utterance for smoother timing.

    This feature ensures that users receive real-time feedback instead of silence, making interactions feel more natural. It's useful for scenarios like **booking confirmations** or **data lookups**, where a response takes a few seconds.

    Visit the [Function delay control](/tools/delay-control) page for more details.
  </Accordion>

  <Accordion title="Upload audio to replace cached items" icon="volume-high" id="upload-audio-to-replace-cached-items">
    Upload pre-recorded audio directly from the **audio management resource** in Agent Studio.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/audio-upload.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=36bcf7b1e37a714e9b4a35e81932eae4" alt="audio-upload" width="3024" height="1428" data-path="images/release-notes/2502/audio-upload.png" />

    **Key benefits:**

    * Easily replace TTS with high-quality voice actor recordings.
    * Improve voice consistency across different agent responses.
    * Initial release supports single file uploads. Bulk upload functionality is planned for a future release.
  </Accordion>

  <Accordion title="Reference variants in Knowledge" icon="layer-group" id="reference-variants-in-the-knowledge-base">
    Reference variant attributes dynamically within Knowledge responses.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/variants.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=f56a79d47c83452504eb60a818d93ddf" alt="variants" width="3024" height="1176" data-path="images/release-notes/2502/variants.png" />

    **How it works:**

    * Add variant attributes by typing `/` or selecting the `+` icon in content fields.
    * Reference existing attributes or create new ones dynamically.
    * Personalize responses by encoding structured variant data.
  </Accordion>

  <Accordion title="Managing transition functions in a flow" icon="arrow-right-arrow-left" id="managing-transition-functions-in-a-flow">
    Transition functions are now managed centrally within the flow editor.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/transition-functions.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=6cad08f0dcd95f46d76602d3dca8d92d" alt="transition-functions" width="3024" height="1630" data-path="images/release-notes/2502/transition-functions.png" />

    **Key benefits:**

    * Prevents accidental deletions when modifying flows.
    * Enables reusing, duplicating, and managing transition functions from a single interface.
    * Streamlines agent configuration and debugging.

    Visit the [flows](/flows/introduction) page for more details.
  </Accordion>

  <Accordion title="Conversation review annotations" icon="magnifying-glass" id="conversation-review-annotations">
    Users can now annotate user conversation turns for:

    * **Missed topics**
    * **Incorrect ASR transcriptions**

    Agent conversation turns can be annotated for **wrong information**.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/annotation-added.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=9a01221bce51980ed071d7f63070ce05" alt="review-annotations" width="3024" height="1594" data-path="images/release-notes/2502/annotation-added.png" />
  </Accordion>

  <Accordion title="Handoff SIP configuration" icon="phone" id="handoff-sip-configuration">
    You can now configure handoff using SIP, with [INVITE](https://datatracker.ietf.org/doc/html/rfc3261#section-13.3.1), [REFER](https://www.ietf.org/rfc/rfc3515.txt), or [BYE](https://www.rfc-editor.org/rfc/rfc3261.html).
    You can also add [SIP headers](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml) to the handoff template.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/handoff-sip.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=15fccb6d4c631397509f110a9ca3f27b" alt="sip-handoff" width="3024" height="1550" data-path="images/release-notes/2502/handoff-sip.png" />

    **How it works:**

    * The default handoff method is set to REFER.
    * You can adjust this to other methods according to the specific needs of your projects.
    * You can add SIP headers to the handoff.

    Visit the [call handoff](/call-handoff/introduction) page for more details.
  </Accordion>

  <Accordion title="Enterprise overview dashboard" icon="chart-bar" id="enterprise-overview-dashboard">
    A new **Enterprise overview dashboard** provides key operational insights and is the new homepage of a project.

    <img src="https://mintcdn.com/polyai/ZVzKq3G72RK1ScpE/images/release-notes/2502/new-dashboard.png?fit=max&auto=format&n=ZVzKq3G72RK1ScpE&q=85&s=a5eeaa2af78641d5acd4b58f0a89fe8a" alt="enterprise-dashboard" width="3016" height="1440" data-path="images/release-notes/2502/new-dashboard.png" />

    **Key benefits:**

    * Monitor total calls, call duration, words generated, and key metrics.
    * Improve oversight of agent performance and containment rates.
    * Can be configured to work alongside custom dashboards for deeper analytics.
  </Accordion>
</AccordionGroup>