Add changelog for 2025-03-27 (#281)

Author: quantstruct-bot

fern/changelog/2025-03-19.mdx

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+# Test Suite, Smart Endpointing, and Compliance Plans, Chat Completion Message Workflows, and Voicemail Detection
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+1. **Test Suite Enhancements**: Developers can now define `targetPlan` and `testerPlan` when creating or updating [test suites](https://api.vapi.ai/api#:~:text=TestSuite), allowing for customized testing configurations without importing phone numbers to Vapi.
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+2. **Smart Endpointing Updates**: You can now select between [`Vapi`](https://api.vapi.ai/api#:~:text=VapiSmartEndpointingPlan) and [`Livekit`](https://api.vapi.ai/api#:~:text=LivekitSmartEndpointingPlan) smart endpointing providers using the `Assistant.startSpeakingPlan.smartEndpointingPlan`; the `customEndpointingRules` property is deprecated and should no longer be used.
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+3. **Compliance Plan Enhancements**: Organizations can now specify compliance settings using the new `compliancePlan` property, enabling features like PCI compliance at the org level.
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+4. **Chat Completion Message Updates**: When working with OpenAI chat completions, you should now use [`ChatCompletionMessageWorkflows`](https://api.vapi.ai/api#:~:text=ChatCompletionMessageWorkflows) instead of the deprecated `ChatCompletionMessage`.
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+5. **Voicemail Detection Defaults Updated**: The default `voicemailExpectedDurationSeconds` for voicemail detection plans has increased from 15 to 25 seconds, affecting how voicemail detection timings are handled.

fern/changelog/2025-03-20.mdx

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+# Introducing Google Calendar Integration, and Chat Test Suite / Rime AI Voice Enhancements
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+1. **Integration with Google Calendar**: You can now create and manage Google Calendar events directly within your tools. Configure OAuth2 credentials through the [dashboard > Build > Provider Keys](https://dashboard.vapi.ai/keys#:~:text=Google%20Calendar) to authenticate and interact with Google Calendar APIs.
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+<Frame caption="Google Calendar Integration">
+    <img src="../static/images/changelog/google-calendar-integration.png" alt="Google Calendar Integration" />
+</Frame>
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+2. **Enhanced Voice Customization for RimeAIVoice**: Gain more control over [Rime AI voice](https://api.vapi.ai/api#:~:text=RimeAIVoice) properties with new options like `reduceLatency`, `inlineSpeedAlpha`, `pauseBetweenBrackets`, and `phonemizeBetweenBrackets`. These settings let you optimize voice streaming and adjust speech delivery to better suit your assistant's needs.
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+3. **Chat Test Suite Enhancements**: You can now create and run chat-based tests in your test suites using the new [`TestSuiteTestChat`](https://api.vapi.ai/api#:~:text=TestSuiteTestChat) to more comprehensively test conversational interactions in your assistant.
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+4. **Maximum Length for Test Suite Chat Scripts**: When creating or updating chat tests, note that the `script` property now has a maximum length of 10,000 characters. Ensure your test scripts conform to this limit to avoid any validation errors.

fern/changelog/2025-03-21.mdx

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+1. **OpenAI Voice Enhancements**: When using [OpenAI Voice models in `Assistant.voice`](https://api.vapi.ai/api#:~:text=OpenAIVoice), you can now use specific text to speech models and add custom instructions to control your assistant's voice output
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+2. **Improved Call Error Reporting**: You can now use new [`Call.endedReason`](https://api.vapi.ai/api#:~:text=Call,-CallBatchError) codes when a call fails to start or ends unexpectedly due to failing to retrieve Vapi objects. Refer to [Call.endedReason](https://api.vapi.ai/api#:~:text=Call,-CallBatchError) for more details.

fern/changelog/2025-03-22.mdx

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+1. **Customizable Background Sound**: You can now use a custom audio file as the background sound in calls by providing a URL in the `backgroundSound` property. This allows you to enhance the call experience with personalized ambient sounds or music.
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+2. **New Recording Format Options in `ArtifactPlan`**: You can specify the recording format as either `'wav;l16'` or `'mp3'` in `Assistant.artifactPlan` or `Call.artifactPlan`. This gives you control over the audio format of call recordings to suit your storage and playback preferences.
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+3. **Integrate with Langfuse for Enhanced Observability**: You can now integrate with Langfuse by setting `assistant.observabilityPlan` to `langfuse`. Add `tags` and `metadata` to your traces to improve monitoring, categorization, and debugging of your application's behavior.

fern/changelog/2025-03-23.mdx

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+1. **Multi-Structured Data Extraction with `StructuredDataMultiPlan`:** You can now extract multiple sets of structured data from calls by configuring `assistant.analysisPlan.structuredDataMultiPlan`. This allows you to define various extraction plans, each producing structured outputs accessible via `call.analysis.structuredDataMulti`.
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+2. **Customizable Voice Speed and Language Settings:** You can now adjust the speech speed and language for your assistant's voice by using the new `speed` and `language` properties in `Assistant.voice`. This enables you to fine-tune the voice output to better match your user's preferences and localize the experience.
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+3. **Integration of OpenAI Transcriber:** The `transcriber` property in assistants now supports `OpenAITranscriber`, allowing you to utilize OpenAI's transcription services. A corresponding `Call.endedReason` value, `pipeline-error-openai-transcriber-failed`, has been added to help you identify when a call ends due to an OpenAI transcriber error.

fern/changelog/2025-03-27.mdx

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+1. **Batch Call Operations**: You can now place multiple calls to different customers at once by providing a list of `customer`s as an array in [`POST /call`](https://api.vapi.ai/api#/Calls/CallController_create).
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+2. **Google Sheets Row Append Tool Added**: You can now append rows to Google Sheets directly from your assistant using [`GoogleSheetsRowAppendTool`](https://api.vapi.ai/api#/Tools/GoogleSheetsRowAppendTool). This allows integration with Google Sheets via the API for automating data entry tasks.
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+3. **Call Control and Scheduling**: You can now schedule calls using the new `SchedulePlan` feature, specifying earliest and latest times for calls to occur. This gives you more control over call timing and scheduling.
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+4. **New Transcriber Options and Fallback Plans**: New transcribers like `GoogleTranscriber` and `OpenAITranscriber` have been added, along with the ability to set `fallbackPlan` for transcribers. This provides more choices and reliability for speech recognition in your applications.