/usr/share/ofono/scripts/answer-calls is in ofono-scripts 1.12.bzr6858+14.04.20140318-0ubuntu1.
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 27 28 29 30 31 32 33 | #!/usr/bin/python3
import dbus
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
modems = manager.GetModems()
for path, properties in modems:
	print("[ %s ]" % (path))
	if "org.ofono.VoiceCallManager" not in properties["Interfaces"]:
		continue
	mgr = dbus.Interface(bus.get_object('org.ofono', path),
					'org.ofono.VoiceCallManager')
	calls = mgr.GetCalls()
	for path, properties in calls:
		state = properties["State"]
		print("[ %s ] %s" % (path, state))
		if state != "incoming":
			continue
		call = dbus.Interface(bus.get_object('org.ofono', path),
						'org.ofono.VoiceCall')
		call.Answer()
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