/usr/share/ofono/scripts/dial-number 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 34 35 36 37 38 39 40 41 42 | #!/usr/bin/python3
import sys
import dbus
if (len(sys.argv) < 2):
	print("Usage: %s [modem] <number> [hide_callerid]" % (sys.argv[0]))
	sys.exit(1)
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
modems = manager.GetModems()
modem = modems[0][0]
hide_callerid = "default"
if (len(sys.argv) == 2):
	number = sys.argv[1]
elif (len(sys.argv) == 3):
	if (sys.argv[2] == "default") or (sys.argv[2] == "enabled") or \
			(sys.argv[2] == "disabled"):
		number = sys.argv[1]
		hide_callerid = sys.argv[2]
	else:
		modem = sys.argv[1]
		number = sys.argv[2]
else:
	modem = sys.argv[1]
	number = sys.argv[2]
	hide_callerid = sys.argv[3]
print("Using modem %s" % modem)
vcm = dbus.Interface(bus.get_object('org.ofono', modem),
						'org.ofono.VoiceCallManager')
path = vcm.Dial(number, hide_callerid)
print(path)
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