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All parameters are passed as query string values on the WebSocket URL. Locked at connection time — cannot be changed mid-session.
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transcription_engine
string
default:"Deepgram"
Deepgram, Telnyx, Google, Azure
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model
string
default:"per engine"
See Engines & Models
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input_format
string
default:"mp3"
See Audio Formats
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sample_rate
integer
default:"16000"
Hz. Required for raw encodings (linear16, mulaw, alaw). Ignored for container formats. Invalid value returns error 40005.
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language
string
default:"en-US"
BCP-47 code. multi for auto-detect. See Language for details.
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interim_results
string
default:"false"
"true" for partial transcripts. See Interim Results for details.
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endpointing
string
default:"100"
Deepgram silence detection in ms. "false" to disable. See Endpointing for details.
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redact
string
PII redaction. Deepgram only. See Redaction for details.
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keyterm
string
Comma-separated boost terms. Deepgram Nova-3/Flux. See Keyword Boosting for details.
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keywords
string
Legacy keyword boosting with intensifiers. Deepgram Nova. See Keyword Boosting for details.
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region
string
default:"eastus"
Azure Speech Services region.
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eot_threshold
float
default:"0.7"
Flux only. Confidence threshold for EndOfTurn events. See End-of-Turn Detection for details.
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eot_timeout_ms
integer
default:"5000"
Flux only. Max silence before forcing EndOfTurn. See End-of-Turn Detection for details.
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eager_eot_threshold
float
Flux only. Speculative EagerEndOfTurn threshold. Disabled by default. See End-of-Turn Detection for details.

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Example

wss://api.telnyx.com/v2/speech-to-text/transcription?transcription_engine=Deepgram&model=nova-3&input_format=wav&language=en-US&interim_results=true