Add changelog for 2025-04-27

[quantstruct-bot]

1. New Assistant Hook for Call Ending Events: You can now define actions to execute when a call is ending using Assistant.hooks\["AssistantHookCallEnding"\]. This allows you to specify actions like transferring the call, saying a message, or invoking a function at the end of a call.

2. Enhanced Voicemail Detection Configuration: Configure voicemail detection more precisely with new Assistant.voicemailDetection.backoffPlan and Assistant.voicemailDetection.beepMaxAwaitSeconds properties. This lets you control retry strategies and set maximum wait times for voicemail beeps.

3. Twilio Authentication Using API Keys: Authenticate with Twilio using apiKey and apiSecret when importing a Twilio Phone Number This replaces the need for authToken.

4. Support for New Voicemail Detection Provider and Model: Utilize the new vapi provider for voicemail detection by configuring Assistant.voicemailDetection.provider. Additionally, the gemini-2.5-flash-preview-04-17 model is now supported in various schemas for advanced capabilities.

5. Expanded Workflow Nodes: Workflows now support Start and Assistant nodes, enabling more complex and customizable call flow designs. This allows for greater flexibility in defining how calls are handled.

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