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You can do this by subscribing for presence events which indicate when a call starts and ends. You can do this in a client-side browser app using PubNub and on a server side app using Webhooks.

You can find more information on this here:

https://developer.ringcentral.com/api-reference#Subscriptions

You can find some tutorials here:

• PubNub: https://ringcentral-tutorials.github.io/subscription-basics-nodejs-demo/
• Webhooks: https://ringcentral-tutorials.github.io/webhook-basics-nodejs-demo/