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Deepgram only. Other engines ignore this parameter.
Controls how long Deepgram waits after silence before finalizing an utterance. 
wss://api.telnyx.com/v2/speech-to-text/transcription?endpointing=300
Default: 100 ms.

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Values

ValueBehavior
Integer (ms)Finalize after this many ms of silence. Lower = faster but more splits.
"false"Disable endpointing entirely. No automatic utterance boundaries.

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Trade-offs

Low values (50–100 ms) — Fast response. Utterances may split mid-sentence on short pauses. High values (300–1000 ms) — More complete sentences. Higher latency before finalization. Disabled ("false") — No automatic splits. Use Finalize control messages to manually trigger boundaries, or rely on CloseStream for a single final transcript.

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Interaction With Utterance End

When endpointing triggers, Deepgram sends the final transcript followed by an utterance end event (if utterance_end_ms is configured server-side — currently 1000 ms). 
{"transcript": "Hello, how are you?", "is_final": true}
{"transcript": "", "is_final": true, "utterance_end": true}
The utterance end marker signals “this speaker turn is done.” See Messages for details.