/usr/share/ofono/scripts/set-speaker-volume 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 | #!/usr/bin/python
import sys
import dbus
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
'org.ofono.Manager')
modems = manager.GetModems()
path = modems[0][0]
cv = dbus.Interface(bus.get_object('org.ofono', path),
'org.ofono.CallVolume')
cv.SetProperty("SpeakerVolume", dbus.Byte(int(sys.argv[1])))
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