​ To learn more, see the sources I considered: [[1] Get Voice Agent](https://docs.retellai.com/api-references/get-agent) [[2] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[3] Increase transcription accuracy](https://docs.retellai.com/reliability/wrong-transcript) ​

### Answer Retell AI supports custom STT (Speech-to-Text) configuration when you set

stt_mode

to

"custom"

[(1) ]() [(2) ]() . The

custom_stt_config

object allows you to specify a

provider

field . Based on the available documentation, Azure is explicitly mentioned as a custom STT provider option [(2) ]() . The documentation shows this example:

json
"custom_stt_config": {
  "provider": "azure",
  "endpointing_ms": 123
}

However, the documentation I have access to doesn't provide a direct comparison of transcription quality between Azure, Deepgram, and Soniox, nor does it explicitly list all available custom STT providers beyond Azure [(1) ]() [(2) ]() . For improving transcription accuracy in general, Retell recommends: - Using Boosted Keywords to add custom vocabulary for domain-specific terms (supports up to 100 keywords) [(3) ]() - Adjusting the denoising mode setting if background noise is affecting transcription - Enabling transcription mode optimized for accuracy if sentences are being cut off If you need specific provider comparisons or a complete list of supported custom STT providers, I'd recommend checking the Retell dashboard or reaching out to their team for the most current information. **

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer Based on the available documentation, I cannot confirm whether Soniox is a valid custom STT provider option for Retell AI [(1) ]() [(2) ]() [(3) ]() . The documentation shows that when

stt_mode

is set to

"custom"

, you must provide a

custom_stt_config

object with a

provider

field . The only provider explicitly mentioned in the documentation is

"azure"

[(1) ]() . The sources don't provide a complete list of all supported custom STT providers beyond Azure [(1) ]() [(2) ]() [(3) ]() . To get confirmation on whether Soniox is supported as a custom STT provider, I recommend: - Checking the Retell dashboard for the full list of available providers - Visiting [Documentation]() - Visiting [Hire certified Retell partner]() Would you like a general answer based on my knowledge instead?

​ To learn more, see the sources I considered: [[1] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[2] Get Agent Versions](https://docs.retellai.com/api-references/get-agent-versions) [[3] List Voice Agents](https://docs.retellai.com/api-references/list-agents) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

API side

found i