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

# Tags

> Special XML tags supported in LLM prompt responses to control speech, call behavior, and audio playback.

When configuring an assistant, the LLM can include special XML tags in its responses. These tags are parsed at runtime to control how the assistant speaks, behaves during a call, and interacts with telephony features.

## Supported Tags

The following tags are supported in LLM prompt responses:

| Tag                               | Purpose                                                                                     | Example                                                              |
| --------------------------------- | ------------------------------------------------------------------------------------------- | -------------------------------------------------------------------- |
| `<interactly_spellout>`           | Spell out letters and numbers (NATO phonetic alphabet for letters, word digits for numbers) | `The number is <interactly_spellout>991123456</interactly_spellout>` |
| `<silence>`                       | No speech; the assistant stays silent                                                       | `<silence>`                                                          |
| `<dtmf>`                          | Send DTMF tones                                                                             | `<dtmf>01</dtmf>`                                                    |
| `<hold_call>`                     | Put the call on hold. Optional message                                                      | `<hold_call>Please hold the line</hold_call>` or `<hold_call/>`      |
| `<play_type>` + `<play_duration>` | Play a sound for N seconds                                                                  | `<play_type>keyboard</play_type><play_duration>0.5</play_duration>`  |
| `<end_call>`                      | End the call                                                                                | `Goodbye<end_call>` or `<end_call>`                                  |
| `<nonInterruptible>`              | Playback that must not be interrupted                                                       | `Please hold while I look that up. <nonInterruptible>`               |

### Spell out

Use `<interactly_spellout>` when the assistant should read individual characters clearly — for example, phone numbers, confirmation codes, or spelled names.

```text theme={null}
The number is <interactly_spellout>+1 248 780 9823</interactly_spellout>
```

The above example will be spoken as:

```text theme={null}
"The number is + One -   Two - Four - Eight.   Seven - Eight. Zero -   Nine. Eight - Two - Three"
```

On the other hand, if you use the following example,

```text theme={null}
Hello this is <interactly_spellout> Ram </interactly_spellout>."
```

it will be spoken as:

```text theme={null}
"Hello this is  R:, as in Romeo. A:, as in Alpha. M: ."
```

Letters are spoken using the NATO phonetic alphabet. Numbers are spoken as word digits (for example, `9` becomes "Nine").

### Silence

Use `<silence>` when the assistant should not speak. The assistant remains silent for that turn.

```text theme={null}
<silence>
```

### DTMF

Use `<dtmf>` to send touch-tone signals during a call — for example, to navigate an IVR menu.

```text theme={null}
<dtmf>01</dtmf>
```

### Hold call

Use `<hold_call>` to place the caller on hold. You can include an optional message that is spoken before the hold begins, or use a self-closing tag to hold without a message.

```text theme={null}
<hold_call>Please hold the line</hold_call>
```

```text theme={null}
<hold_call/>
```

### Play sound

Use `<play_type>` together with `<play_duration>` to play a background sound for a specified number of seconds while allowing the caller to barge in.
Supported `play_type` values:

| Value             | Description                  |
| ----------------- | ---------------------------- |
| `keyboard`        | Keyboard typing sound        |
| `music-1`         | Background music track       |
| `office-keyboard` | Office keyboard typing sound |
| `office`          | Office ambient sound         |

```text theme={null}
<play_type>keyboard</play_type><play_duration>0.5</play_duration>
```

You can combine `<hold_call/>` with play tags to hold the call while a sound plays. User can't barge in during the hold time. This is useful for playing a sound for a specific duration and then putting the call on hold:

```text theme={null}
<hold_call/><play_type>keyboard</play_type><play_duration>0.5</play_duration>
```

In the above example, the assistant put the call on hold for 0.5 seconds (play\_duration value) and while on hold, it will play the keyboard typing sound for 0.5 seconds. User can't barge in during the hold time.

### End call

Use `<end_call>` to end the call after the assistant finishes speaking.

```text theme={null}
<end_call>
```

### Non-interruptible

Use `<nonInterruptible>` for playback that must not be interrupted. For example, disclosures, hold flows, or critical tool execution.

```text theme={null}
Please hold while I look that up. <nonInterruptible>
```