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/usr/share/ofono/scripts/cancel-ussd is in ofono-scripts 1.17.bzr6912+16.04.20160314.3-0ubuntu1.

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#!/usr/bin/python3

import sys
import dbus

bus = dbus.SystemBus()

manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')

modems = manager.GetModems()

if (len(sys.argv) == 2):
	path = sys.argv[1]
else:
	path = modems[0][0]

ussd = dbus.Interface(bus.get_object('org.ofono', path),
					'org.ofono.SupplementaryServices')

properties = ussd.GetProperties()
state = properties["State"]

print("State: %s" % (state))

if state != "idle":
	ussd.Cancel()