Using Symbl Javascript SDK To Push Speaker Events

In this example, it establishes a connection using a phone number through PSTN, to send speaker events, generate insights, and display a summary URL with the output. You can see how to initialize the Voice SDK, connect to the endpoint, push speaker events and get the summary URL.

Throughout the documentation you'll find various references to these variable names, which you will have to replace with your values:

Key	Description
`APP_ID`	The application ID you get from the home page of the platform.
`APP_SECRET`	The application secret you get from the home page of the platform.
`AUTH_TOKEN`	The JWT you get after authentication with Sybml.
`DEFAULT_PHONE_NUMBER`	A phone number that you want the API to connect to. Be sure to include the country code.
`EMAIL_ADDRESS`	The email address you wish to send the summary email to.

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Getting started#

This example runs on a Node server, so we will use symbl-node package.

Open .env file and add your APP_ID, APP_SECRET, EMAIL_ADDRESS.

Initialize the SDK#

await sdk.init({
  appId: process.env.APP_ID,
  appSecret: process.env.APP_SECRET,
  basePath: 'https://api.symbl.ai'
});

Connect to Endpoint#

const connection = await sdk.startEndpoint(endpointConfig);

Set Up Configuration Options#

First of all let's provide phone number and endpoint type:

endpoint: {
  type: 'pstn',
  phoneNumber: process.env.DEFAULT_PHONE_NUMBER
}

In case you want to use a sip connection, you can use type: sip and provide SIP URI to dial in to. This should be unique for an active call/meeting in your system. You can also provide a dtmf code if you have one. You can find this code on the meeting platform invite. You can leave it blank if not connecting to the meeting platform

{
  dtmf: "<code>",
  type: 'sip',
  uri: 'sip:124@domain.com'
}

You can also pass a custom audioConfig configuration object. If not provided, it uses PCMU with an 800 sample rate. If you want to provide it, you can do it like so:

audioConfig: {
  encoding: 'OPUS',
  sampleRate: 48000
}

Getting The Connection ID#

To send speaker events we will need connectionId unique to each active connection. to get it you can simply retrieve it from connection response:

const connectionId = connection.connectionId;

Sending The Speaker Eventt#

We can send different speaker events to our connection indicating that different speakers started speaking. That will give us more personalized insights and get a better meeting summary

In our example, we will do it by calling helper function getScheduleEvent, which we will review in a bit. We pass SpeakerEvent type to it by using SpeakerEvent.types enum from symbl-node, passing user data and timestamp

const scheduleEvent = getScheduleEvent(sdk, connectionId);

setTimeout(() => {
  // Schedule all the events to be sent.
  scheduleEvent(SpeakerEvent.types.startedSpeaking, users.john, 0);
  scheduleEvent(SpeakerEvent.types.stoppedSpeaking, users.john, 5);
}, 1000);

We retrieve users just from the global array of users but in real-world example that might be user's data retrieved from the database.

const users = {
  john: {
    userId: 'john@example.com',
    name: 'John'
  },
  mary: {
    userId: 'mary@example.com',
    name: 'Mary'
  }
};

In order to push event to our connection we will create an event like so:

const speakerEvent = new SpeakerEvent({
  type: eventType,
  user
});

speakerEvent.timestamp = new Date().toISOString();

And push it using the pushEventOnConnection function provided by SDK:

sdk.pushEventOnConnection(connectionId, speakerEvent.toJSON(), (err) => {
  if (err) {
    console.error('Error during push event.', err);
  } else {
    console.log('Event pushed!');
  }
});

Full Code Example#

require('dotenv').config()

const {sdk, SpeakerEvent} = require('symbl-node')

const phoneNumber = undefined // replace this with the phone number, or configure DEFAULT_PHONE_NUMBER in .env file.

sdk
  .init({
    appId: process.env.APP_ID,
    appSecret: process.env.APP_SECRET,
    basePath: 'https://api.symbl.ai',
  })
  .then(() => {
    console.log('SDK Initialized')

    sdk
      .startEndpoint({
        endpoint: {
          // type: 'sip',         // Use this if you're trying to dial in to a SIP trunk.
          // uri: 'sip:username@domain.com',
          type: 'pstn',
          phoneNumber: phoneNumber || process.env.DEFAULT_PHONE_NUMBER //,
          //dtmf: '', // you can find this on the meeting platform invite. Omit or leave blank if not connecting to a meeting platform
        },
        actions: [
          {
            invokeOn: 'stop',
            name: 'sendSummaryEmail',
            parameters: {
              emails: [process.env.SUMMARY_EMAIL], // Add valid email addresses to received email
            },
          },
        ],
      })
      .then((connection) => {
        const connectionId = connection.connectionId
        console.log('Successfully connected.', connectionId)

        const speakerEvent = new SpeakerEvent({
          type: SpeakerEvent.types.startedSpeaking,
          user: {
            userId: 'john@example.com',
            name: 'John',
          },
        })

        setTimeout(() => {
          speakerEvent.timestamp = new Date().toISOString()
          sdk.pushEventOnConnection(
            connectionId,
            speakerEvent.toJSON(),
            (err) => {
              if (err) {
                console.error('Error during push event.', err)
              } else {
                console.log('Event pushed!')
              }
            },
          )
        }, 1000)

        setTimeout(() => {
          speakerEvent.type = SpeakerEvent.types.stoppedSpeaking
          speakerEvent.timestamp = new Date().toISOString()

          sdk.pushEventOnConnection(
            connectionId,
            speakerEvent.toJSON(),
            (err) => {
              if (err) {
                console.error('Error during push event.', err)
              } else {
                console.log('Event pushed!')
              }
            },
          )
        }, 12000)

        // Scheduling stop endpoint call after 60 seconds
        setTimeout(() => {
          sdk
            .stopEndpoint({
              connectionId: connection.connectionId,
            })
            .then(() => {
              console.log('Stopped the connection')
              console.log('Summary Info:', connection.summaryInfo)
              console.log('Conversation ID:', connection.conversationId)
            })
            .catch((err) =>
              console.error('Error while stopping the connection.', err),
            )
        }, 10000)
      })
      .catch((err) => console.error('Error while starting the connection', err))
  })
  .catch((err) => console.error('Error in SDK initialization.', err))

Running The Example#

Create a javascript file named app.js and copy this code into the file. Fill in the placeholder values with the proper values. Use npm to install the required libraries: npm install symbl-node. Now in the terminal run

$ node app.js

If successful you should receive a response in the console.

info

If you have any questions or concerns about our API, you can join our Support Slack or send us an email at developer@symbl.ai