#!/usr/bin/python
import phone
from phone import isdn
from phone import pots
from phone import g3
#phone.isdn()//1st case
#phone.pots()
#phone.g3()
#phone.isdn.isdn()//2nd case
#phone.pots.pots()
#phone.g3.g3()
isdn.isdn()
pots.pots()
g3.g3()
