# Message a Phone Number

**POST /api/conversations.json**

Send an outbound message to a phone number. A `comment` must be specified in the request.

**Also supported on this endpoint:**

- **Whisper a Phone Number** — use `whisper` / `whisper_attachments` instead of `comment` / `attachments`.
- **Message a Group Conversation** — pass `phone_number` as an **array** plus required `group_uuid` for a group-messaging department.


## Servers
- Production: https://application.textline.com (Production)



## Parameters



### Body: application/json (object)

- **phone_number** (string | array[string])
  Contact phone number (string), or array of numbers for group messaging.

- **group_uuid** (string)
  Department UUID. Required for group messaging; optional otherwise (defaults to first department).

- **comment** (object)
  Customer-visible message content (use for outbound SMS).

- **whisper** (object)
  Agent-only whisper content.

- **attachments** (array[object])
  Optional attachments for a customer-visible message.

- **whisper_attachments** (array[object])
  Optional attachments for a whisper.

- **resolve** (string)
  If set (e.g. "1"), resolve the conversation after sending.



## Responses
### 200
OK

#### Body: application/json (object)
- **conversation** (object)

- **post** (object)

- **group** (object)



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