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Deepgram only. Other engines ignore these parameters.
Two parameters control keyword boosting. They target different Deepgram model generations.

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keyterm — Nova-3 and Flux

Comma-separated list of terms to boost. Simple — no intensifiers. 
?keyterm=Telnyx,WebRTC,SIP
Deepgram Nova-3 and Flux only. Ignored on older models.

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keywords — Nova (Legacy)

Terms with optional intensity scores. Format: keyword:intensifier. 
?keywords=Telnyx:2
Deepgram Nova only. Not supported on Flux (silently ignored).

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Which To Use

ModelParameter
Fluxkeyterm
Nova-3keyterm
Novakeywords
Nova-2keywords

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Examples

Boost multiple terms on Nova-3: 
?transcription_engine=Deepgram&model=nova-3&keyterm=Telnyx,SIP,RTP,WebRTC
Boost with intensifiers on legacy Nova: 
?transcription_engine=Deepgram&model=nova&keywords=Telnyx:2&keywords=telephony:1