---
title: "Changes to Start Conversation Relay"
method: POST
path: "/calls/{call_control_id}/actions/conversation_relay_start"
---

# Changes to Start Conversation Relay

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

> Every recorded change to this operation, newest first.

## Timeline

Changed in 5 of 89 revisions.

- **2026-10-15** `a72569d69430`: 5 breaking, 18 info
- **2026-06-16** `e990c478a58a`: 3 info
- **2026-05-27** `996660490005`: 2 breaking, 7 warning, 20 info
- **2026-05-15** `61186b75b9e6`: 1 breaking, 3 warning, 3 info
- **2026-05-14** `a144ff96b4ac`: 1 info

## Changes

- **2026-10-15** `a72569d69430`: 5 breaking, 18 info
  - added `subschema #1` to the request body `allOf` list
  - removed `subschema #1, subschema #2, subschema #3` from the request body `anyOf` list
  - removed `#/components/schemas/RimeVoiceSettings` from the `conversation_relay_settings/languages/items/voice_settings` request property `oneOf` list
  - removed `#/components/schemas/RimeVoiceSettings` from the `languages/items/voice_settings` request property `oneOf` list
  - removed `#/components/schemas/RimeVoiceSettings` from the `voice_settings` request property `oneOf` list
  - added the new optional request property `conversation_relay_settings/languages/items/transcription_engine_config/eager_eot_threshold`
  - added the new optional request property `conversation_relay_settings/languages/items/transcription_engine_config/eot_threshold`
  - added the new optional request property `conversation_relay_settings/languages/items/transcription_engine_config/interim_results`
  - added the new optional request property `languages/items/transcription_engine_config/eager_eot_threshold`
  - added the new optional request property `languages/items/transcription_engine_config/eot_threshold`
  - added the new optional request property `languages/items/transcription_engine_config/interim_results`
  - added the new optional request property `transcription_engine_config/eager_eot_threshold`
  - added the new optional request property `transcription_engine_config/eot_threshold`
  - added the new optional request property `transcription_engine_config/interim_results`
  - added `soniox` discriminator mapping keys to the `conversation_relay_settings/languages/items/voice_settings` request property
  - added `soniox` discriminator mapping keys to the `languages/items/voice_settings` request property
  - added `soniox` discriminator mapping keys to the `voice_settings` request property
  - removed `rime` discriminator mapping keys from the `conversation_relay_settings/languages/items/voice_settings` request property
  - removed `rime` discriminator mapping keys from the `languages/items/voice_settings` request property
  - removed `rime` discriminator mapping keys from the `voice_settings` request property
  - added `#/components/schemas/SonioxVoiceSettings` to the `conversation_relay_settings/languages/items/voice_settings` request property `oneOf` list
  - added `#/components/schemas/SonioxVoiceSettings` to the `languages/items/voice_settings` request property `oneOf` list
  - added `#/components/schemas/SonioxVoiceSettings` to the `voice_settings` request property `oneOf` list
- **2026-06-16** `e990c478a58a`: 3 info
  - added the new optional request property `conversation_relay_settings/languages/items/voice_settings/oneOf[subschema #8: Inworld Voice Settings]/delivery_mode`
  - added the new optional request property `languages/items/voice_settings/oneOf[subschema #8: Inworld Voice Settings]/delivery_mode`
  - added the new optional request property `voice_settings/oneOf[subschema #8: Inworld Voice Settings]/delivery_mode`
- **2026-05-27** `996660490005`: 2 breaking, 7 warning, 20 info
  - added the new required request property `conversation_relay_settings/languages/items/language`
  - added the new required request property `languages/items/language`
  - removed the request property `conversation_relay_settings/languages/items/code`
  - removed the request property `languages/items/code`
  - removed the request property `transcription/language`
  - removed the request property `transcription/model`
  - removed the request property `transcription/provider`
  - removed the request property `transcription_language`
  - removed the request property `tts_language`
  - added the new optional request property `conversation_relay_settings/languages/items/transcription_engine`
  - added the new optional request property `conversation_relay_settings/languages/items/transcription_engine_config`
  - added the new optional request property `conversation_relay_settings/languages/items/voice_settings`
  - added the new optional request property `custom_parameters`
  - added the new optional request property `dtmf_detection`
  - added the new optional request property `interruptible`
  - added the new optional request property `interruptible_greeting`
  - added the new optional request property `languages/items/transcription_engine`
  - added the new optional request property `languages/items/transcription_engine_config`
  - added the new optional request property `languages/items/voice_settings`
  - added the new optional request property `provider`
  - added the new optional request property `structured_provider`
  - added the new optional request property `transcription_engine`
  - added the new optional request property `transcription_engine_config`
  - added the new optional request property `tts_provider`
  - added the new optional request property `url`
  - added `subschema #1` to the request body `anyOf` list
  - request property `transcription` deprecated
  - added `minimax, inworld` discriminator mapping keys to the `voice_settings` request property
  - added `#/components/schemas/MinimaxVoiceSettings, #/components/schemas/InworldVoiceSettings` to the `voice_settings` request property `oneOf` list
- **2026-05-15** `61186b75b9e6`: 1 breaking, 3 warning, 3 info
  - added the pattern `^wss?://` to the request property `conversation_relay_url`
  - removed the request property `participants`
  - removed the request property `send_message_history_updates`
  - removed the request property `user_response_timeout_ms`
  - added the new optional request property `conversation_relay_settings`
  - added `subschema #1, subschema #2` to the request body `anyOf` list
  - the request property `conversation_relay_url` became optional
- **2026-05-14** `a144ff96b4ac`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/team-telnyx/apis/telnyx-api/docs/calls/:call_control_id/actions/conversation_relay_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/conversation_relay_start/post)