How to manage the participants of a conference call using the webrtc library?

You can use the telephony session event notifications to catch telephony events to detect participants (added and removed) in a conference call. It is very complicated and I cannot explain how to detect here. Pay attention to the event similar to the example event below when a participant is added to a conference:

{
    "uuid": "1025258805069352046",
    "event": "/restapi/v1.0/account/80964XXXX/extension/622953XXXXX/telephony/sessions",
    "timestamp": "2024-02-27T16:04:52.558Z",
    "subscriptionId": "3ca0ec27-a916-4260-82ad-035752e61da2",
    "ownerId": "6228832XXXX",
    "body": {
      "sequence": 9,
      "sessionId": "1229016182016",
      "telephonySessionId": "s-a0d17b82ddacdz18deb4ee132z1878e190000",
      "serverId": "10.13.23.184.TAM",
      "eventTime": "2024-02-27T16:04:52.223Z",
      "parties": [
        {
          "accountId": "80964XXXX",
          "extensionId": "622953XXXXX",
          "id": "p-a0d17b82ddacdz18deb4ee132z1878e190000-1",
          "direction": "Outbound",
          "to": {
            "phoneNumber": "11119",
            "name": "Paco Vu",
            "extensionId": "622883XXXXX"
          },
          "from": {
            "phoneNumber": "+1650XXXXXXX",
            "name": "Agent 122",
            "extensionId": "622953XXXXX",
            "deviceId": "80254586XXXX"
          },
          "status": {
                                 "code": "Gone",
                                 "reason": "Conference",
                                 "peerId": {
                                        "telephonySessionId": "s-a0d7bfa2dd198z18deb4fcc72z184536c0000",
                                        "sessionId": "0",
                                        "partyId": "p-a0d7bfa2dd198z18deb4fcc72z184536c0000-2"
                                 },
            "rcc": false
          },
          "park": {},
          "missedCall": false,
          "standAlone": false,
          "muted": false
        }
      ],
      "origin": {
        "type": "Call"
      }
    }
  }

And similar to this example event when a participant is removed from the conference call:

{
    "uuid": "6754846377425683265",
    "event": "/restapi/v1.0/account/80964XXXX/extension/622953XXXXX/telephony/sessions",
    "timestamp": "2024-02-27T16:06:13.233Z",
    "subscriptionId": "3ca0ec27-a916-4260-82ad-035752e61da2",
    "ownerId": "6228832XXXX",
    "body": {
      "sequence": 11,
      "sessionId": "1229016182016",
      "telephonySessionId": "s-a0d17b82ddacdz18deb4ee132z1878e190000",
      "serverId": "10.13.23.184.TAM",
      "eventTime": "2024-02-27T16:06:13.166Z",
      "parties": [
        {
          "accountId": "80964XXXX",
          "extensionId": "622953XXXXX",
          "id": "p-a0d17b82ddacdz18deb4ee132z1878e190000-1",
          "direction": "Outbound",
          "to": {
            "phoneNumber": "11119",
            "name": "Paco Vu",
            "extensionId": "622883XXXXX"
          },
          "from": {
            "phoneNumber": "+1650XXXXXXX",
            "name": "Agent 122",
            "extensionId": "622953XXXXX",
            "deviceId": "80254586XXXX"
          },
          "status": {
            "code": "Disconnected",
            "rcc": false
          },
          "park": {},
          "missedCall": false,
          "standAlone": false,
          "muted": false
        }
      ],
      "origin": {
        "type": "Call"
      }
    }
  },

The best way to learn about this is to implement the notification, run a test conference call and print out all the events and learn from the event payloads.

You can call the Delete call party API to delete a party (from the original direct call) and that will disconnect that party from the conference call he was added to the conference call.