> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vobiz.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# The User Element

> Use the User XML element on Vobiz inside a Dial verb to specify a SIP endpoint (user@domain) to dial - supports multiple Users for parallel calls.

You can use the User element to specify a SIP endpoint (user) to dial.

You can use multiple User elements within a Dial element to simultaneously call multiple SIP endpoint users. The first user to answer is connected to the current call and the rest are hung up.

**Note:** When dialing multiple numbers simultaneously, if confirmSound and confirmKey are specified for the Dial element, the phone that confirms the key correctly is bridged and all others fail.

## Attributes

**`sendDigits`** *(string)*

Tells the API to play DTMF tones when the call is answered. This is useful when dialing a phone number and an extension. Vobiz dials the number, and when the automated system picks up, it sends DTMF tones to connect to the extension.

**Allowed values:** any digits and the w character. Each w character tells the Vobiz API to wait 0.5 seconds.

No default value.

**`sendOnPreanswer`** *(boolean)*
If set to true, sendDigits is executed when the called party is in early media instead of the answer state.

**Allowed values:** true, false

Defaults to false.

**`sipHeaders`** *(string)*
List of SIP headers to send, separated by commas. For example, head1=val1,head2=val2,head3=val3,…,headN=valN. The SIP headers are always prefixed with X-VH-, and are always present for each HTTP request called by the dialed leg.

**Allowed values:** Only \[A-Z], \[a-z] and \[0-9] characters are allowed for SIP header names and values to ensure you can encode them in a URL.

## Setting the caller ID

The caller ID presented to the SIP endpoint is controlled by the **`callerId`** attribute on the parent [`Dial`](/xml/dial) element - not on `User` itself. Set it to override the number displayed to the called party (for example, to present your own Vobiz number when forwarding or transferring a call):

```xml theme={null}
<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Speak>Please hold while we transfer your call.</Speak>
    <Dial callerId="+14155551234">
        <User>sip:john1234@registrar.vobiz.ai</User>
    </Dial>
</Response>
```

If `callerId` is omitted, the current caller's caller ID is used by default. See [Transfer a Call](/call/transfer-call) for a full walkthrough of using the `Dial` element to transfer and forward calls.

## Dialing extensions

This code calls the 2410 extension at sip:[john1234@registrar.vobiz.ai](mailto:john1234@registrar.vobiz.ai). The User element describes the SIP endpoint and gives it the attribute sendDigits. To dial the extension a couple of seconds after the number is dialed, we add a few leading w characters, telling Vobiz to wait 0.5 seconds for each w.

### Response

```xml theme={null}
<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Dial>
        <User sendDigits="wwww2410">sip:john1234@registrar.vobiz.ai</User>
    </Dial>
</Response>
```