Server events

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{
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  "message": {
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    "type": "<server-message-type>",
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    "call": { /* Call Object */ },
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    /* other fields depending on type */
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  }
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}

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{
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  "model": {
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    "provider": "openai",
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    "model": "gpt-4o",
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    "functions": [
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      {
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        "name": "sendEmail",
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        "description": "Used to send an email to a client.",
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        "parameters": {
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          "type": "object",
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          "properties": {
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            "emailAddress": { "type": "string" },
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            "message": { "type": "string" }
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          },
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          "required": ["emailAddress", "message"]
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        }
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      }
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    ]
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  }
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}

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{
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  "message": {
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    "type": "tool-calls",
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    "call": { /* Call Object */ },
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    "toolWithToolCallList": [
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      {
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        "name": "sendEmail",
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        "toolCall": { "id": "abc123", "parameters": { "emailAddress": "john@example.com", "message": "Hi!" } }
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      }
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    ],
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    "toolCallList": [
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      { "id": "abc123", "name": "sendEmail", "parameters": { "emailAddress": "john@example.com", "message": "Hi!" } }
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    ]
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  }
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}

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{
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  "results": [
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    {
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      "name": "sendEmail",
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      "toolCallId": "abc123",
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      "result": "{ \"status\": \"sent\" }"
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    }
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  ]
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}

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{
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  "message": {
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    "type": "assistant-request",
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    "call": { /* Call Object */ }
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  }
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}

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{ "assistantId": "your-saved-assistant-id" }

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{
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  "assistant": {
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    "firstMessage": "Hey Ryan, how are you?",
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    "model": {
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      "provider": "openai",
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      "model": "gpt-4o",
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      "messages": [
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        { "role": "system", "content": "You're Ryan's assistant..." }
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      ]
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    }
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  }
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}

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{ "destination": { "type": "number", "phoneNumber": "+11234567890" } }

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{
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  "destination": {
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    "type": "number",
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    "phoneNumber": "+14155552671",
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    "callerId": "{{phoneNumber.number}}",
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    "extension": "101",
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    "message": "Connecting you to support."
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  }
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}

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{
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  "destination": {
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    "type": "sip",
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    "sipUri": "sip:support@example.com",
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    "sipHeaders": { "X-Account": "gold" },
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    "message": "Transferring you now."
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  }
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}

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{ "error": "Sorry, not enough credits on your account, please refill." }

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{
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  "message": {
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    "type": "status-update",
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    "call": { /* Call Object */ },
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    "status": "ended"
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  }
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}

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{
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  "message": {
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    "type": "end-of-call-report",
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    "endedReason": "hangup",
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    "call": { /* Call Object */ },
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    "artifact": {
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      "recording": { /* Recording object with URLs */ },
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      "transcript": "AI: How can I help? User: What's the weather? ...",
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      "messages": [
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        { "role": "assistant", "message": "How can I help?" },
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        { "role": "user", "message": "What's the weather?" }
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      ]
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    }
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  }
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}

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{
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  "message": {
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    "type": "hang",
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    "call": { /* Call Object */ }
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  }
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}

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{
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  "message": {
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    "type": "conversation-update",
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    "messages": [ /* current conversation messages */ ],
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    "messagesOpenAIFormatted": [ /* openai-formatted messages */ ]
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  }
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}

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{
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  "message": {
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    "type": "transcript",
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    "role": "user",
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    "transcriptType": "partial",
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    "transcript": "I'd like to book...",
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    "isFiltered": false,
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    "detectedThreats": [],
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    "originalTranscript": "I'd like to book..."
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  }
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}

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{
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  "message": {
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    "type": "speech-update",
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    "status": "started",
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    "role": "assistant",
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    "turn": 2
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  }
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}

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{
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  "message": {
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    "type": "model-output",
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    "output": { /* token or tool call */ }
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  }
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}

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{
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  "message": {
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    "type": "transfer-destination-request",
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    "call": { /* Call Object */ }
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  }
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}

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{
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  "destination": { "type": "number", "phoneNumber": "+11234567890" },
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  "message": { "type": "request-start", "message": "Transferring you now" }
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}

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{
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  "message": {
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    "type": "transfer-update",
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    "destination": { /* assistant | number | sip */ }
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  }
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}

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{
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  "message": {
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    "type": "user-interrupted"
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  }
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}

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{
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  "message": {
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    "type": "language-change-detected",
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    "language": "es"
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  }
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}

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{
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  "message": {
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    "type": "phone-call-control",
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    "request": "forward",
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    "destination": { "type": "sip", "sipUri": "sip:agent@example.com" }
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  }
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}

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{
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  "message": {
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    "type": "phone-call-control",
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    "request": "hang-up"
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  }
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}

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{
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  "message": {
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    "type": "knowledge-base-request",
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    "messages": [ /* conversation so far */ ],
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    "messagesOpenAIFormatted": [ /* openai-formatted messages */ ]
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  }
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}

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{
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  "documents": [
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    { "content": "Return policy is 30 days...", "similarity": 0.92, "uuid": "doc-1" }
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  ]
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}

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{
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  "message": {
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    "type": "voice-input",
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    "input": "Hello, world!"
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  }
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}

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{
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  "message": {
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    "type": "voice-request",
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    "text": "Hello, world!",
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    "sampleRate": 24000
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  }
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}

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{
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  "message": {
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    "type": "call.endpointing.request",
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    "messagesOpenAIFormatted": [ /* openai-formatted messages */ ]
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  }
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}

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{ "timeoutSeconds": 0.5 }

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{ "message": { "type": "chat.created", "chat": { /* Chat */ } } }

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{ "message": { "type": "session.created", "session": { /* Session */ } } }