---
title: "Update an existing participant in the conversation"
method: POST
path: "/v1/Conversations/{ConversationSid}/Participants/{Sid}"
tags: ["ConversationsV1Participant"]
---

# Update an existing participant in the conversation

`POST /v1/Conversations/{ConversationSid}/Participants/{Sid}`

## Request

- Base URL: `https://conversations.twilio.com`
- URL: `https://conversations.twilio.com/v1/Conversations/{ConversationSid}/Participants/{Sid}`
- Auth: HTTP basic

Update an existing participant in the conversation

## Path parameters

- `ConversationSid` string, required
- `Sid` string, required

## Headers

- `X-Twilio-Webhook-Enabled` 'true' | 'false'

## Request body `application/x-www-form-urlencoded`

- object
  - `DateCreated` string, date-time: The date that this resource was created.
  - `DateUpdated` string, date-time: The date that this resource was last updated.
  - `Attributes` string: An optional string metadata field you can use to store any data you wish. The string value must contain structurally valid JSON if specified. **Note** that if the attributes are not set "{}" will be returned.
  - `RoleSid` string: The SID of a conversation-level [Role](https://www.twilio.com/docs/conversations/api/role-resource) to assign to the participant.
  - `MessagingBinding.ProxyAddress` string: The address of the Twilio phone number that the participant is in contact with. 'null' value will remove it.
  - `MessagingBinding.ProjectedAddress` string: The address of the Twilio phone number that is used in Group MMS. 'null' value will remove it.
  - `Identity` string: A unique string identifier for the conversation participant as [Conversation User](https://www.twilio.com/docs/conversations/api/user-resource). This parameter is non-null if (and only if) the participant is using the Conversations SDK to communicate. Limited to 256 characters.
  - `LastReadMessageIndex` integer, nullable: Index of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.
  - `LastReadTimestamp` string: Timestamp of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.

## Response `200`

OK

- ConversationsV1ConversationConversationParticipant
  - `account_sid` string, nullable: The unique ID of the [Account](https://www.twilio.com/docs/iam/api/account) responsible for this participant.
  - `conversation_sid` string, nullable: The unique ID of the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for this participant.
  - `sid` string, nullable: A 34 character string that uniquely identifies this resource.
  - `identity` string, nullable: A unique string identifier for the conversation participant as [Conversation User](https://www.twilio.com/docs/conversations/api/user-resource). This parameter is non-null if (and only if) the participant is using the Conversations SDK to communicate. Limited to 256 characters.
  - `attributes` string, nullable: An optional string metadata field you can use to store any data you wish. The string value must contain structurally valid JSON if specified. **Note** that if the attributes are not set "{}" will be returned.
  - `messaging_binding` unknown
  - `role_sid` string, nullable: The SID of a conversation-level [Role](https://www.twilio.com/docs/conversations/api/role-resource) to assign to the participant.
  - `date_created` string, date-time, nullable: The date that this resource was created.
  - `date_updated` string, date-time, nullable: The date that this resource was last updated.
  - `url` string, uri, nullable: An absolute API resource URL for this participant.
  - `last_read_message_index` integer, nullable: Index of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.
  - `last_read_timestamp` string, nullable: Timestamp of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.

## Changes

- **2025-07-03** (v1) `92d1169c37c2`: 1 breaking
  - the `messaging_binding` response's property type changed from `object` to no type for status `200`
- **2025-03-11** (v1) `b4d0e634cd69`: 1 breaking
  - the `messaging_binding` response's property type changed from no type to `object` for status `200`
- **2023-08-10** (v1) `4e3f150aaa78`: 1 info
  - api tag `ConversationsV1Participant` added

[Operation history](https://skmtc.dev/twilio/apis/conversations-v1/changes/v1/Conversations/:ConversationSid/Participants/:Sid/post.md)

---

[API](https://skmtc.dev/twilio/apis/conversations-v1.md) - [All operations](https://skmtc.dev/twilio/apis/conversations-v1/llms.txt) - [OpenAPI document](https://skmtc.dev/twilio/apis/conversations-v1/revisions/6a37056c7727?raw)