Get External phone number for active call in queue

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
}