#!/usr/bin/python3

import dbus
import sys

bus = dbus.SystemBus()

if len(sys.argv) == 2:
    path = sys.argv[1]
else:
    manager = dbus.Interface(bus.get_object('org.ofono', '/'),
                                'org.ofono.Manager')
    modems = manager.GetModems()
    path = modems[0][0]

imsreg = dbus.Interface(bus.get_object('org.ofono', path),
                            'org.ofono.IpMultimediaSystem')
imsreg.Unregister()