# Initiate an outbound SMS

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## Zoom SMS handler for initiating outbound SMS

Zoom SMS Handler seamlessly initiates outbound SMS messages from third-party applications directly in the Zoom client.

A dedicated handler URI scheme makes it easy to pre-fill phone numbers from external apps in Zoom to initiate SMS communications.

**Handler URI scheme**

```plaintext
zoomphonesms://{recipient_nr}?callerid={from_nr}
```

## Initiate outbound SMS messages

Zoom provides support for various URI schemes that empowers you to send SMS messages from the Zoom client directly from your applications.

## Prerequisites

Before using these schemes, ensure the following prerequisites:

-   Installation of the latest version of the Zoom client with an active session. (Zoom client 6.1.0 and above for both desktop and mobile clients)
-   Possession of a valid Zoom Phone number that enables you to send and receive SMS.

## Supported URI schemes

Zoom extends support for the following URI scheme to seamlessly launch the Zoom client and send SMS messages: `zoomphonesms://{recipient_nr}?callerid={from_nr}`

## Implement the SMS scheme

### Recipient number

The recipient's phone number follows immediately after the scheme component, indicated by a colon (`:`) and two slashes (`//`).

This parameter is mandatory and specifies the recipient who will receive the message.

### CallerID parameter

The `callerid` parameter allows users to specify the desired caller ID for the outbound SMS message. For example `zoomphonesms://+123456789?callerid=+16692520210` initiates an SMS message with the specified `callerid +16692520210`.

Note that the `callerid` must adhere to Zoom's format requirements. If the caller ID is invalid, we ignore the parameter.

#### Streamlined SMS messaging

The Zoom SMS Handler simplifies outbound SMS messaging. As a result, you can prefill phone numbers from third-party apps into Zoom with the designated handler URI scheme.