New Workflows API, Telnyx Phone Number Support, Voice Options, and much more

1. Workflows Replace Blocks: The API has migrated from blocks to workflows with new /workflow endpoints. Introduction to Workflows
   You can now use UpdateWorkflowDTO where conversation components (Say, Gather, ApiRequest, Hangup, Transfer nodes) are explicitly connected via edges to create directed conversation flows.

```json { "name": "Customer Support Workflow", "nodes": [ { "id": "greeting", "type": "Say", "text": "Hello, welcome to customer support. Do you need help with billing or technical issues?" }, { "id": "menu", "type": "Gather", "options": ["billing", "technical", "other"] }, { "id": "billing", "type": "Say", "text": "I'll connect you with our billing department." }, { "id": "technical", "type": "Say", "text": "I'll connect you with our technical support team." }, { "id": "transfer_billing", "type": "Transfer", "destination": { "type": "number", "number": "+1234567890" } }, { "id": "transfer_technical", "type": "Transfer", "destination": { "type": "number", "number": "+1987654321" } } ], "edges": [ { "from": "greeting", "to": "menu" }, { "from": "menu", "to": "billing", "condition": { "type": "logic", "liquid": "{% if input == 'billing' %} true {% endif %}" } }, { "from": "menu", "to": "technical", "condition": { "type": "logic", "liquid": "{% if input == 'technical' %} true {% endif %}" } }, { "from": "billing", "to": "transfer_billing" }, { "from": "technical", "to": "transfer_technical" } ] } ```

2. Telnyx Phone Number Support: Telnyx is now available as a phone number provider alongside Twilio and Vonage.

   • Use the TelnyxPhoneNumber, CreateTelnyxPhoneNumberDTO, and UpdateTelnyxPhoneNumberDTO schemas with /phone-number endpoints to create and update Telnyx phone numbers.
   • The Call.phoneCallProviderId now includes Telnyx's callControlId alongside Twilio's callSid and Vonage's conversationUuid.

3. New Voice Options:

   • Vapi Voices: New Vapi voices - Elliot, Rohan, Lily, Savannah, and Hana
   • Hume Voice: New provider with octave model and customizable voice settings
   • Neuphonic Voice: New provider with neu_hq (higher quality) and neu_fast (faster) models

4. New Cerebras Model: CerebrasModel Supports llama3.1-8b and llama-3.3-70b models

5. Enhanced Transcription:

   • New Providers: ElevenLabs and Speechmatics transcribers now available.
   • DeepgramTranscriber Numerals: New numerals option converts spoken numbers to digits (e.g., "nine-seven-two" → "972")

6. Improved Voicemail Detection: You can now use multiple provider implementations for assistant.voicemailDetection (Google, OpenAI, Twilio). OpenAI implementation allows configuring detection duration (5-60 seconds, default: 15).

7. Smart Endpointing Upgrade: Now supports LiveKit as an alternative to Vapi's custom-trained model in StartSpeakingPlan.smartEndpointingEnabled. LiveKit only supports English but may offer different endpointing characteristics.

8. Observability with Langfuse: New assistant.observabilityPlan property allows integration with Langfuse for tracing and monitoring of assistant calls. Configure with LangfuseObservabilityPlan.

9. More Credential Support: Added support for Cerebras, Google, Hume, InflectionAI, Mistral, Trieve, and Neuphonic credentials in assistant.credentials