# How to use Twilio IVR Dial Trees with the Zoom Meeting SDK

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One of the advantages of the [Zoom Meeting SDK](/docs/meeting-sdk/) is our [PSTN](https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0064472) and [SIP](https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0060661) call out/call in compatibility. This allows developers to connect phone users to Zoom Meetings. Going a step further, PSTN and SIP support allows the Meeting SDK to be used with complex IVR dial tree use cases. For example, if I am calling a phone number to talk to a support agent, pressing numbers along the way to route me to the right point of contact, I can be connected into a Zoom Meeting via the Zoom PSTN or SIP bridge with an agent present in the Zoom Meeting.

Below is an example of how to use the Zoom Meeting with [Twilio's IVR dial tree](https://www.twilio.com/docs/voice/interactive-voice-response).

## Prerequisites

1. [Twilio account](https://www.twilio.com/docs/voice/quickstart/no-code-voice-studio-quickstart#sign-up-for-or-sign-in-to-twilio) with a [phone number](https://www.twilio.com/docs/voice/quickstart/no-code-voice-studio-quickstart#get-a-phone-number).
1. [Zoom User account](https://zoom.us/signup) with the [Meeting SDK](/docs/meeting-sdk/get-credentials/) and [PSTN](https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0064472) or [SIP](https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0060661) add on.

## Getting the Zoom Meeting dial in info

There are a few ways to get the dial in info for a Zoom Meeting.

-   Meeting SDK functions ([android example](https://marketplacefront.zoom.us/sdk/meeting/android/us/zoom/sdk/PhoneHelper.CallInPhoneNumberInfo.html)).

-   [GET Meeting REST API](/docs/api/meetings/#tag/meetings/GET/meetings/{meetingId}) (see `global_dial_in_numbers`).

    ```json
    {
       "id": 123456789,
       "h323_password": "1234", // numeric passcode for sip, h323, PSTN dial in
       "settings": [
          "global_dial_in_numbers": [{
             "city": "New York",
             "country": "US",
             "country_name": "US",
             "number": "+1 1234567890",
             "type": "toll"
          }]
       ]
    }
    ```

-   [GET Meeting Invitation REST API](/docs/api/meetings/#tag/meetings/GET/meetings/{meetingId}/invitation) (see `sip_links`).
    ```js
    {
       "sip_links": [
          "5550100@zoomcrc.com"
       ]
    }
    ```

The Zoom dial in info convention is Phone Number -> Meeting ID followed by # -> Participant ID (optional) followed by # -> password followed by #. The Participant ID is optional, to bypass it, just press #.

## Using Twilio IVR Dial Tree

The Twilio IVR Dial Tree platform allows you to design dial trees via code using your favorite language with the [TwiML™ language](https://www.twilio.com/docs/voice/twiml), or with a drag and drop studio designer.

### IVR Dial Tree using Twilio Studio

1. Setup the [base IVR flow in Twilio studio](https://www.twilio.com/docs/studio/tutorials/how-to-build-an-ivr).
1. Update the [connect call](https://www.twilio.com/docs/studio/tutorials/how-to-build-an-ivr#connect-the-calls) number to your [Zoom Meeting PSTN dial in number or SIP address](#getting-the-zoom-meeting-dial-in-info).

    [Twilio Studio does not currently support including DTMF tones or pauses](https://stackoverflow.com/questions/53356939/dial-an-extension-using-dtmf-tones-after-a-pause-twilio-studio), which would allow you to auto dial the meeting ID and passcode. However, this is something you can do with Twilio TwiML™, see below for an example.

1. Click save and publish.
   ![Twilio IVR with Zoom Meeting dial in](/img/blog/blog-meeting-twilio-ivr.png)

### IVR Dial Tree using Twilio TwiML™

1. Use the [Twilio Voice SDK](https://www.twilio.com/docs/voice/twiml/dial) to connect the call to your [Zoom Meeting PSTN dial in number or SIP address](#getting-the-zoom-meeting-dial-in-info).

    You can auto dial the meeting ID (`id` ^) and passcode (`h323_password` ^) using the [`sendDigits` property](https://www.twilio.com/docs/voice/twiml/number#attributes-senddigits).

    TwiML™ PSTN example:

    ```xml
    <?xml version="1.0" encoding="UTF-8"?>
    <Response>
       <Number sendDigits="wwww123456789#wwww#wwww1234#">
          11234567890
       </Number>
    </Response>
    ```

    Node.js PSTN example:

    ```js
    const VoiceResponse = require("twilio").twiml.VoiceResponse;

    const response = new VoiceResponse();
    const dial = response.dial();
    dial.number(
        {
            sendDigits: "wwww123456789#wwww#wwww1234#",
        },
        "11234567890",
    );

    console.log(response.toString());
    ```

    TwiML™ SIP example:

    ```xml
    <Response>
       <Dial>
          <Sip>
             sip:5550100@zoomcrc.com
         </Sip>
       </Dial>
    </Response>
    ```

    Node.js SIP example:

    ```js
    const VoiceResponse = require("twilio").twiml.VoiceResponse;

    const response = new VoiceResponse();
    const dial = response.dial();
    dial.sip("sip:5550100@zoomcrc.com");

    console.log(response.toString());
    ```

## Testing the tree

1. Make a phone call to your Twilio number.
1. Press 1. or the respective flow you designed to dial into your Zoom meeting number.
1. If successful, a PSTN or SIP user will have joined the Zoom Meeting.