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/usr/share/ofono/scripts/hold-and-answer is in ofono-scripts 1.12.bzr6858+14.04.20140318-0ubuntu1.

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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()
modem = modems[0][0]

if (len(sys.argv) == 2):
	modem = sys.argv[1]

manager = dbus.Interface(bus.get_object('org.ofono', modem),
						'org.ofono.VoiceCallManager')

manager.HoldAndAnswer(timeout=100)