Add changelog updates for 2025-03-09

fern/changelog/2025-03-09.mdx

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+## Enhanced Voicemail Detection, File Processing, Knowledge Base Integration, and Invoicing Updates
+
+1. **Track Voicemail Detection Cost, Configure Google and Twilio Voicemail Detection Plans**
+
+* You can now configure provider-specific settings and track voicemail detection costs through the new `VoicemailDetectionCost` schema at `call.costs[type=voicemail-detection]`.
+* Configure Google or Twilio voicemail detection settings using the new [`GoogleVoicemailDetectionPlan`](https://api.vapi.ai/api#:~:text=GoogleVoicemailDetectionPlan) and [`TwilioVoicemailDetectionPlan`](https://api.vapi.ai/api#:~:text=TwilioVoicemailDetectionPlan) schemas.
+
+```json
+// Google configuration example
+{
+  "provider": "google",
+  "voicemailExpectedDurationSeconds": 15  // Range: 5-60 seconds
+}
+```
+
+```json
+// Twilio configuration example
+{
+  "provider": "twilio",
+  "enabled": true,
+  "machineDetectionTimeout": 30,  // Range: 3-59 seconds
+  "voicemailDetectionTypes": ["machine_end_beep", "machine_end_silence"]
+}
+```
+
+2. **Improved File Processing Statuses and Parsed Text Content**
+
+* File processing statuses have been renamed to better reflect their purpose: `processing` → `done` → `failed`.
+* Two new properties have been added to the [`File`](https://api.vapi.ai/api#:~:text=File) schema: `parsedTextUrl` and `parsedTextBytes`, providing direct access to parsed text content from processed files.
+
+3. **Google Gemini Models for Knowledge Base Integration**
+
+* The [`KnowledgeBase`](https://api.vapi.ai/api#:~:text=KnowledgeBase) schema now fully supports Google's Gemini models with specific model options.
+* You can use Gemini models in your knowledge bases at `assistant.model.tools[type=query].knowledgeBases`.
+
+```json
+"model": {
+  "enum": [
+    "gemini-2.0-flash-thinking-exp",
+    "gemini-2.0-pro-exp-02-05",
+    "gemini-2.0-flash",
+    "gemini-2.0-flash-lite-preview-02-05",
+    "gemini-2.0-flash-exp",
+    "gemini-2.0-flash-realtime-exp",
+    "gemini-1.5-flash",
+    "gemini-1.5-flash-002",
+    "gemini-1.5-pro",
+    "gemini-1.5-pro-002",
+    "gemini-1.0-pro"
+  ]
+}
+```
+
+4. **New Invoicing Features**
+
+* You can now use [`InvoicePlan`](https://api.vapi.ai/api#:~:text=InvoicePlan) schema for customizing invoice information with company details.
+* This can be accessed via the new `invoicePlan` property on the [`Subscription`](https://api.vapi.ai/api#:~:text=Subscription) schema.
+* Customize company name, email, tax ID, and address for your invoices.
+
+5. **Additional Voice Options**
+
+* Five new voice options have been added to the [`FallbackVapiVoice`](https://api.vapi.ai/api#:~:text=FallbackVapiVoice) schema: `Adi`, `Julia`, `Maibri (Web)`, `Maibri (Phone)`, and `Ashley`.
+* Configure these voices in your assistant fallback plans at `assistant.voice.fallbackPlan.voices`.
+<Frame caption="Additional Vapi Voices">
+    <img src="../static/images/changelog/additional-vapi-voices.png" alt="Additional Vapi Voices" />
+</Frame>