Recommended Parameters by Use Case

Best parameter configurations for realtime transcription depending on your use case.

Voice Agents

Optimize for low latency and fast turn-taking.

Parameter	Recommended value	Why
endpointing	0.05 - 0.1	Closes utterances fast, keeping turn-taking snappy. See Endpointing.
maximum_duration_without_endpointing	15	Prevents very long utterances from staying open without cutting off the conversation.
messages_config.receive_partial_transcripts	true	Enables interim results so the agent can start processing early. Use the speech_stop event to know when the user has finished speaking. See Partial transcripts.
realtime_processing.custom_vocabulary	true	Add product names and action keywords so the agent can react accurately.

If utterances get cut off mid-sentence, raise endpointing slightly.

Meeting Recorders

Optimize for a structured, speaker-attributed live transcript.

Parameter	Recommended value	Why
endpointing	0.3 - 0.5	Lets speakers finish sentences.
maximum_duration_without_endpointing	15	Caps utterances when a speaker doesn’t pause.
messages_config.receive_partial_transcripts	true	Feeds live captions to the UI.
language_config.languages	Set explicitly	Avoids detection overhead.
realtime_processing.custom_vocabulary	true	Company, project, and participant names.

Call Centers

Optimize for speaker identification and accuracy on telephony audio.

Parameter	Recommended value	Why
endpointing	0.2 - 0.4	Responsive without cutting mid-sentence.
maximum_duration_without_endpointing	15	Caps monologue-style segments.
language_config.languages	Set explicitly (e.g. ["en"])	Avoids detection errors on noisy audio.
realtime_processing.custom_vocabulary	true	Product, plan, and internal terms.

For noisy telephony audio, set pre_processing.speech_threshold to 0.8.

Subtitles & Captioning

Optimize for syncing text with the speaker.

Parameter	Recommended value	Why
endpointing	0.3 (live) / 0.8 (post-production)	Lower = closer to speech; higher = cleaner blocks.
maximum_duration_without_endpointing	5	Keeps subtitle segments readable.
messages_config.receive_partial_transcripts	true	Shows words as they are spoken.
language_config.languages	Set explicitly	Avoids detection lag.

For post-production subtitles from a recording, use the Pre-recorded API with subtitles instead.

To enhance accuracy for any use case

Configure domain-specific words and phrases with Custom vocabulary or Custom spelling to capture context-specific terms (brand names, technical words, etc.).

Language set up

Set language_config.languages when the language is known. See Language detection for more details.

Code Switching

Enable language_config.code_switching when speakers mix languages in the same audio. See Code switching for more details.