---
title: "Join AI Assistant Conversation"
method: POST
path: "/calls/{call_control_id}/actions/ai_assistant_join"
tags: ["Call Commands"]
---

# Join AI Assistant Conversation

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

## Request

- Base URL: `https://api.telnyx.com/v2`
- URL: `https://api.telnyx.com/v2/calls/{call_control_id}/actions/ai_assistant_join`
- Auth: HTTP bearer

Add a participant to an existing AI assistant conversation. Use this command to bring an additional call leg into a running AI conversation.

## Path parameters

- `call_control_id` string, required

## Request body

- AIAssistantJoinRequest
  - `conversation_id` string, required: The ID of the AI assistant conversation to join.
  - `participant` AIAssistantJoinParticipant, required
    - `id` string, required: The call_control_id of the participant to add to the conversation.
    - `role` 'user', required: The role of the participant in the conversation.
    - `name` string: Display name for the participant.
    - `on_hangup` 'continue_conversation' | 'end_conversation': Determines what happens to the conversation when this participant hangs up.
  - `client_state` string: Use this field to add state to every subsequent webhook. It must be a valid Base-64 encoded string.
  - `command_id` string: Use this field to avoid duplicate commands. Telnyx will ignore any command with the same `command_id` for the same `call_control_id`.

## Response `200`

Successful response upon making a call control command that includes conversation_id.

- object
  - `data` CallControlCommandResultWithConversationId
    - `result` string
    - `conversation_id` string, uuid: The ID of the conversation created by the command.

## Other responses

- `422`: Unprocessable entity. The request was well-formed but could not be processed due to semantic errors. This includes validation errors, invalid parameter values, call state errors, conference errors, queue errors, recording/transcription errors, and business logic violations.
- `default`: Unexpected error

## Changes

> 152 revisions in range; 1 not diffed.

- **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`

[Operation history](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/changes/calls/:call_control_id/actions/ai_assistant_join/post.md)

---

[API](https://skmtc.dev/team-telnyx/apis/telnyx-api-2.md) - [All operations](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/llms.txt) - [OpenAPI document](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/revisions/f82938f53ff4?raw)