# Mute, Hold and DTMF

> Control a live browser call with toggleMute(), toggleHold(), sendDigit() and hangup() in the Edesy JavaScript SDK.

Source: https://edesy.in/docs/webrtc/sdk/mute-hold-dtmf

A live `Call` in the Edesy SDK has four controls: `toggleMute()` mutes or unmutes the microphone, `toggleHold()` holds or resumes the call, `sendDigit(d)` sends a DTMF keypad digit (for example to navigate an IVR menu), and `hangup()` ends the call. The `mute`, `hold` and `dtmf` events tell your UI when state changes.

## Controls

| Method | What it does | Event |
|---|---|---|
| `call.toggleMute()` | Mutes the microphone, or unmutes it if muted | `mute` |
| `call.toggleHold()` | Puts the call on hold, or resumes it if held | `hold` |
| `call.isHeld` | `true` while the call is on hold | - |
| `call.sendDigit(d)` | Sends one DTMF digit: `0`-`9`, `*` or `#` | `dtmf` |
| `call.hangup()` | Ends the call | `ended` |

## Example: call controls

```js
muteBtn.onclick = () => call.toggleMute();
holdBtn.onclick = () => call.toggleHold();
hangupBtn.onclick = () => call.hangup();

call.on("mute", (muted) => (muteBtn.textContent = muted ? "Unmute" : "Mute"));
call.on("hold", (held) => (holdBtn.textContent = held ? "Resume" : "Hold"));

// On-screen keypad
for (const key of "123456789*0#") {
  const b = document.createElement("button");
  b.textContent = key;
  b.onclick = () => call.sendDigit(key);
  keypad.appendChild(b);
}
```

## How to build the controls

1. **Show the controls** after `answered`.
2. **Wire the buttons** to `toggleMute()`, `toggleHold()`, `sendDigit()` and `hangup()`.
3. **Update labels** from the `mute` and `hold` events rather than tracking state yourself.
4. **Hide the controls** on `ended` or `failed`.

## FAQ

### Does mute stop the other person hearing me?

Yes. Mute stops sending audio from the microphone. You still hear the other side.

### What does the other person hear on hold?

The call is held until you resume it with `toggleHold()` again.

### How do I send a digit to an IVR menu?

Call `call.sendDigit("1")` while the call is answered. Send one digit per call to `sendDigit()`.

### Can I send several digits at once?

Call `sendDigit()` once per digit. Leave a short pause between digits if the far end misses any.

### How do I know whether the call is on hold?

Read `call.isHeld`, or listen for the `hold` event.

### Does the drop-in dialer support DTMF?

Yes. Its keypad sends digits with `sendDigit()` while a call is active.