---
title: "Create a new User Defined Message for the given Call SID."
method: POST
path: "/2010-04-01/Accounts/{AccountSid}/Calls/{CallSid}/UserDefinedMessages.json"
tags: ["Api20100401UserDefinedMessage"]
---

# Create a new User Defined Message for the given Call SID.

`POST /2010-04-01/Accounts/{AccountSid}/Calls/{CallSid}/UserDefinedMessages.json`

Create a new User Defined Message for the given Call SID.

## Path parameters

- `AccountSid` string, required
- `CallSid` string, required

## Response `201`

Created

- ApiV2010AccountCallUserDefinedMessage
  - `account_sid` string, nullable — The SID of the [Account](https://www.twilio.com/docs/iam/api/account) that created User Defined Message.
  - `call_sid` string, nullable — The SID of the [Call](https://www.twilio.com/docs/voice/api/call-resource) the User Defined Message is associated with.
  - `sid` string, nullable — The SID that uniquely identifies this User Defined Message.
  - `date_created` string, date-time-rfc-2822, nullable — The date that this User Defined Message was created, given in RFC 2822 format.

---

[API](https://skmtc.net/twilio/apis/api-v2010.md) · [All operations](https://skmtc.net/twilio/apis/api-v2010/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/twilio/api-v2010/revisions/a6753266b8b0/schema)