{
"message_type": "conversation",
"event_type": "conversation.utterance.streaming",
"seq": 500,
"conversation_id": "your-conversation-id",
"inference_id": "550e8400-e29b-41d4-a716-446655440000",
"turn_idx": 7,
"properties": {
"role": "pal",
"speech": "Here is everything said so far in this turn.",
"participant_id": "pcb7a34da5fe",
"participant_name": "Charlie",
"content_index": 3,
"final": false,
"is_interrupted": false
}
}Utterance Streaming Event
Outbound: Tavus sends each streaming chunk so you can show what is being said in real time as the accumulated text grows during the turn.
Contrast with conversation.utterance, which delivers the full turn text at once rather than streaming chunks.
For PAL turns, duplicate app-messages are sent with properties.role of "pal" and legacy "replica" (same payload otherwise).
participant_id and participant_name say who spoke the turn, using the handle conversation.joined announced them under.
conversation for conversation-layer app messages.
"conversation"
conversation.utterance.streaming.
"conversation.utterance.streaming"
Unix timestamp (seconds since epoch) indicating when this event was created. Use this to build timestamped transcripts or reconstruct the timeline of a conversation.
1746000000.123
Monotonic per event; a higher seq was emitted later. Use with turn_idx as in Event ordering and turn tracking.
42
The unique identifier for the conversation.
"c123456"
A unique identifier for the PAL's current inference turn. Can be used to correlate with other events such as conversation.utterance and conversation.started_speaking.
"83294d9f-8306-491b-a284-791f56c8383f"
Turn index; increments when conversation.respond is processed. Groups utterances, tool calls, and speaking-state events for the same turn. See Event ordering and turn tracking.
3
PAL and user streaming share this shape; is_interrupted appears on PAL messages when relevant.
Show child attributes
Show child attributes