/usr/share/ofono/scripts/hold-and-answer 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 | #!/usr/bin/python3
import sys
import dbus
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
'org.ofono.Manager')
modems = manager.GetModems()
modem = modems[0][0]
if (len(sys.argv) == 2):
modem = sys.argv[1]
manager = dbus.Interface(bus.get_object('org.ofono', modem),
'org.ofono.VoiceCallManager')
manager.HoldAndAnswer(timeout=100)
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