The user active calls list also internal calls via a call queue and that is why you see the Outbound call also. I can't explain why and what those internal calls are for but as you can see, they all has different session id and telephony session id.

In this case, I recommend you to use the /presence?detailedTelephonyState=true to read active calls and detect the 'from' phone number. See sample code and result.

async function getUserTelephonyStatus(

  try {

    var endpoint = `/restapi/v1.0/account/~/extension/~/presence?detailedTelephonyState=true`

    var res = await platform.get(endpoint)

    var jsonObj = await res.json()

    if (jsonObj.hasOwnProperty('activeCalls')){

      for (var record of jsonObj.activeCalls){

        console.log(record)

      }

    }

  }catch(e) {

      console.log(e.message)

  }

}

// example result

{

  id: 's-a0d...',

  direction: 'Inbound',

  fromName: 'Demo queue - WIRELESS CALLER',

  from: '+1650224xxxx',

  toName: 'Demo queue',

  to: '+1209248xxxx',

  telephonyStatus: 'Ringing',

  sessionId: '961173946016',

  startTime: '2022-12-05T20:56:59.822Z',

  partyId: 'p-a0d...',

  telephonySessionId: 's-a0d...',

  callInfo: {

    primary: { type: 'QueueName', value: 'Demo queue' },

    additional: { type: 'CallerIdName', value: 'WIRELESS CALLER' }

  },

  queueCall: true

}