/usr/share/ofono/scripts/create-multiparty is in ofono-scripts 1.17.bzr6912+16.04.20160314.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26  | #!/usr/bin/python3
import sys
import dbus
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
if (len(sys.argv) == 1):
	modems = manager.GetModems()
	path = modems[0][0]
elif (len(sys.argv) == 2):
	path = sys.argv[1]
else:
	print("Usage: %s [modem]" % (sys.argv[0]))
	sys.exit(1)
manager = dbus.Interface(bus.get_object('org.ofono', path),
						'org.ofono.VoiceCallManager')
mpty = manager.CreateMultiparty()
for path in mpty:
	print(path)
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