---
title: "Changes to Transcription start"
method: POST
path: "/calls/{call_control_id}/actions/transcription_start"
---

# Changes to Transcription start

`POST /calls/{call_control_id}/actions/transcription_start`

> Every recorded change to this endpoint, newest first.
> 99 revisions in range; 1 not diffed.

## Timeline

Changed in 9 of 99 revisions.

- **2026-09-21** `1581f4d44566` — 1 info
- **2026-09-17** `4596ec306e59` — 2 info
- **2026-09-16** `a6a61a29ecdd` — 3 info
- **2026-08-17** `1571b0380bd7` — 3 breaking
- **2026-08-04** `8f5f4e537994` — 4 breaking
- **2026-07-30** `924fbdb1e5a1` — 3 info
- **2026-07-22** `ce9e90fc16f3` — 3 info
- **2026-07-13** `afc3349ad4f1` — 1 breaking, 2 info
- **2026-07-02** `224ed0d8a5c3` — 1 breaking, 2 info

## Changes

- **2026-09-21** `1581f4d44566` — 1 info
  - added the new `omi-health/omi-med-stt-v1` enum value to the request property `transcription_engine_config/oneOf[subschema #9: Transcription engine Parakeet config]/transcription_model`
- **2026-09-17** `4596ec306e59` — 2 info
  - the `transcription_model` request property default value changed from `assemblyai/universal-streaming` to `assemblyai/universal-3-5-pro`
  - added the new `assemblyai/universal-3-5-pro` enum value to the request property `transcription_engine_config/oneOf[subschema #6: Transcription engine AssemblyAI config]/transcription_model`
- **2026-09-16** `a6a61a29ecdd` — 3 info
  - added `Cohere` discriminator mapping keys to the `transcription_engine_config` request property
  - added the new `Cohere` enum value to the request property `transcription_engine`
  - added `#/components/schemas/TranscriptionEngineCohereConfig` to the `transcription_engine_config` request property `oneOf` list
- **2026-08-17** `1571b0380bd7` — 3 breaking
  - the response's body type changed from `object` to no type for status `default`
  - the `errors/items/` response's property type changed from `object` to no type for status `default`
  - the `errors/items/code` response's property type changed from `integer` to `string`, and format from `int32` to `integer` for status `default`
- **2026-08-04** `8f5f4e537994` — 4 breaking
  - the response's body type changed from no type to `object` for status `default`
  - the `errors/items/` response's property type changed from no type to `object` for status `default`
  - the `errors/items/code` response's property type changed from `string` to `integer`, and format from `integer` to `int32` for status `default`
  - the `errors/items/source/pointer` response's property format changed from `json-pointer` to no format for status `default`
- **2026-07-30** `924fbdb1e5a1` — 3 info
  - added `Reson8` discriminator mapping keys to the `transcription_engine_config` request property
  - added the new `Reson8` enum value to the request property `transcription_engine`
  - added `#/components/schemas/TranscriptionEngineReson8Config` to the `transcription_engine_config` request property `oneOf` list
- **2026-07-22** `ce9e90fc16f3` — 3 info
  - added `Humain` discriminator mapping keys to the `transcription_engine_config` request property
  - added the new `Humain` enum value to the request property `transcription_engine`
  - added `#/components/schemas/TranscriptionEngineHumainConfig` to the `transcription_engine_config` request property `oneOf` list
- **2026-07-13** `afc3349ad4f1` — 1 breaking, 2 info
  - removed the enum value `parakeet/tdt-0.6b-v3` of the request property `transcription_engine_config/oneOf[subschema #9: Transcription engine Parakeet config]/transcription_model`
  - the `transcription_model` request property default value changed from `parakeet/tdt-0.6b-v3` to `nvidia/parakeet-v3`
  - added the new `nvidia/parakeet-v3` enum value to the request property `transcription_engine_config/oneOf[subschema #9: Transcription engine Parakeet config]/transcription_model`
- **2026-07-02** `224ed0d8a5c3` — 1 breaking, 2 info
  - removed the enum value `nvidia/parakeet-v3` of the request property `transcription_engine_config/oneOf[subschema #9: Transcription engine Parakeet config]/transcription_model`
  - the `transcription_model` request property default value changed from `nvidia/parakeet-v3` to `parakeet/tdt-0.6b-v3`
  - added the new `parakeet/tdt-0.6b-v3` enum value to the request property `transcription_engine_config/oneOf[subschema #9: Transcription engine Parakeet config]/transcription_model`

---

[Operation](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/docs/calls/:call_control_id/actions/transcription_start/post.md) · [API](https://skmtc.dev/team-telnyx/apis/telnyx-api-2.md) · [Page](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/changes/calls/:call_control_id/actions/transcription_start/post)