from datetime import datetime

records = [
    {'source': '48-996355555', 'destination': '48-666666666', 'end': 1564610974, 'start': 1564610674},
    {'source': '41-885633788', 'destination': '41-886383097', 'end': 1564506121, 'start': 1564504821},
    {'source': '48-996383697', 'destination': '41-886383097', 'end': 1564630198, 'start': 1564629838},
    {'source': '48-999999999', 'destination': '41-885633788', 'end': 1564697158, 'start': 1564696258},
    {'source': '41-833333333', 'destination': '41-885633788', 'end': 1564707276, 'start': 1564704317},
    {'source': '41-886383097', 'destination': '48-996384099', 'end': 1564505621, 'start': 1564504821},
    {'source': '48-999999999', 'destination': '48-996383697', 'end': 1564505721, 'start': 1564504821},
    {'source': '41-885633788', 'destination': '48-996384099', 'end': 1564505721, 'start': 1564504821},
    {'source': '48-996355555', 'destination': '48-996383697', 'end': 1564505821, 'start': 1564504821},
    {'source': '48-999999999', 'destination': '41-886383097', 'end': 1564610750, 'start': 1564610150},
    {'source': '48-996383697', 'destination': '41-885633788', 'end': 1564505021, 'start': 1564504821},
    {'source': '48-996383697', 'destination': '41-885633788', 'end': 1564627800, 'start': 1564626000}
]


def classify_by_phone_number(records):
    pass
