/usr/share/ofono/scripts/set-tty 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 | #!/usr/bin/python
import dbus
import sys
bus = dbus.SystemBus()
if len(sys.argv) == 3:
	path = sys.argv[1]
	enable = int(sys.argv[2])
elif len(sys.argv) == 2:
	manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
	modems = manager.GetModems()
	path = modems[0][0]
	enable = int(sys.argv[1])
else:
	print("%s [PATH] {0|1}" % (sys.argv[0]))
	exit(1)
print("Setting TTY for modem %s..." % path)
texttelephony = dbus.Interface(bus.get_object('org.ofono', path),
						'org.ofono.TextTelephony')
texttelephony.SetProperty("Enabled", dbus.Boolean(enable));
 |