---
title: "Changes to Start AI Assistant"
method: POST
path: "/calls/{call_control_id}/actions/ai_assistant_start"
---

# Changes to Start AI Assistant

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

> Every recorded change to this operation, newest first.

## Timeline

Changed in 10 of 95 revisions.

- **2026-10-27** `9e481ac12c4c`: 2 info
- **2026-10-21** `a2e3f7a0ec7b`: 2 info
- **2026-10-21** `824e8d33d07a`: 2 warning
- **2026-10-21** `4198718f2811`: 2 info
- **2026-10-15** `a72569d69430`: 2 warning, 10 info
- **2026-06-05** `8a8c40f458c5`: 1 breaking, 1 info
- **2026-05-18** `c260e29f1496`: 1 info
- **2026-05-14** `50870cc05614`: 1 breaking, 1 info
- **2026-05-14** `a144ff96b4ac`: 1 breaking, 1 info
- **2026-05-08** `30cb1ddce91b`: 1 breaking, 27 info

## Changes

- **2026-10-27** `9e481ac12c4c`: 2 info
  - added the new `assemblyai/universal-3-6-pro` enum value to the request property `assistant/transcription/model`
  - added the new `assemblyai/universal-3-6-pro` enum value to the request property `transcription/model`
- **2026-10-21** `a2e3f7a0ec7b`: 2 info
  - added the new `speechmatics/linden-1` enum value to the request property `assistant/transcription/model`
  - added the new `speechmatics/linden-1` enum value to the request property `transcription/model`
- **2026-10-21** `824e8d33d07a`: 2 warning
  - removed the request property `voice`
  - removed the request property `voice_settings`
- **2026-10-21** `4198718f2811`: 2 info
  - added the new optional request property `voice`
  - added the new optional request property `voice_settings`
- **2026-10-15** `a72569d69430`: 2 warning, 10 info
  - removed the request property `voice`
  - removed the request property `voice_settings`
  - added the new optional request property `assistant/tools/items/oneOf[subschema #3: WebhookTool]/timeout_ms`
  - added the new optional request property `assistant/transcription`
  - added the new optional request property `assistant/voice_settings`
  - the `language` request property default value `auto` was removed
  - added the new `assemblyai/universal-3-5-pro` enum value to the request property `transcription/model`
  - added the new `cohere/ar-stt` enum value to the request property `transcription/model`
  - added the new `humain/realtime` enum value to the request property `transcription/model`
  - added the new `nvidia/parakeet-v3` enum value to the request property `transcription/model`
  - added the new `omi-health/omi-med-stt-v1` enum value to the request property `transcription/model`
  - added the new `reson8/turns` enum value to the request property `transcription/model`
- **2026-06-05** `8a8c40f458c5`: 1 breaking, 1 info
  - removed `subschema #1: targets_list` from the `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` request property `oneOf` list
  - added `subschema #1` to the `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` request property `oneOf` list
- **2026-05-18** `c260e29f1496`: 1 info
  - added the new `soniox/stt-rt-v4` enum value to the request property `transcription/model`
- **2026-05-14** `50870cc05614`: 1 breaking, 1 info
  - removed `subschema #1` from the `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` request property `oneOf` list
  - added `subschema #1: targets_list` to the `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` request property `oneOf` list
- **2026-05-14** `a144ff96b4ac`: 1 breaking, 1 info
  - removed `subschema #1: targets_list` from the `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` request property `oneOf` list
  - added `subschema #1` to the `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` request property `oneOf` list
- **2026-05-08** `30cb1ddce91b`: 1 breaking, 27 info
  - request property `transcription/model` was restricted to a list of enum values
  - added the new optional request property `assistant/external_llm/authentication_method`
  - added the new optional request property `assistant/external_llm/base_url`
  - added the new optional request property `assistant/external_llm/certificate_ref`
  - added the new optional request property `assistant/external_llm/forward_metadata`
  - added the new optional request property `assistant/external_llm/llm_api_key_ref`
  - added the new optional request property `assistant/external_llm/model`
  - added the new optional request property `assistant/external_llm/token_retrieval_url`
  - added the new optional request property `assistant/fallback_config/external_llm`
  - added the new optional request property `assistant/fallback_config/llm_api_key_ref`
  - added the new optional request property `assistant/fallback_config/model`
  - added the new optional request property `transcription/language`
  - added `xai` discriminator mapping keys to the `voice_settings` request property
  - added the new `assemblyai/universal-streaming` enum value to the request property `transcription/model`
  - added the new `azure/fast` enum value to the request property `transcription/model`
  - added the new `azure/realtime` enum value to the request property `transcription/model`
  - added the new `deepgram/flux` enum value to the request property `transcription/model`
  - added the new `deepgram/nova-2` enum value to the request property `transcription/model`
  - added the new `deepgram/nova-3` enum value to the request property `transcription/model`
  - added the new `distil-whisper/distil-large-v2` enum value to the request property `transcription/model`
  - added the new `flux` enum value to the request property `transcription/model`
  - added the new `google/latest_long` enum value to the request property `transcription/model`
  - added the new `openai/whisper-large-v3-turbo` enum value to the request property `transcription/model`
  - added the new `speechmatics/enhanced` enum value to the request property `transcription/model`
  - added the new `speechmatics/standard` enum value to the request property `transcription/model`
  - added the new `xai/grok-stt` enum value to the request property `transcription/model`
  - request property `assistant/tools/items/oneOf[subschema #5: TransferTool]/transfer/targets` list-of-types was widened by adding types `string` to media type `application/json`
  - added `#/components/schemas/XAIVoiceSettings` to the `voice_settings` request property `oneOf` list

---

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