I managed to reproduce this with yesterday's build on my mako.

I spent some time yesterday afternoon debugging.  In order to catch if
the dialback was caused by the upper layers, I decided to try and snoop
on DBus 'Dial' calls to the ofono's VoiceCallManager interface.  In
order to snoop these calls, I needed to create a file drop a fail named
'99-eavesdrop.conf' into /etc/dbus-1/system.d ( and reboot ):

root@ubuntu-phablet:/etc/dbus-1/system.d# more 99-eavesdrop.conf 
<!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd";>
<busconfig>
<policy context="default">
  <allow send_destination="*" eavesdrop="true"/>
  <!-- Allow everything to be received -->
  <allow eavesdrop="true"/>
</policy> 
</busconfig>

Once added, I can snoop the calls with this command:

# dbus-monitor --system
"type='method_call',interface=org.ofono.VoiceCallManager"

I also ran the ofono script 'monitor-ofono' to watch ofono signals in a
seperate window.   For each incoming call, I'm seeing the expected
"CallAdded" signal.   And, as expected ( by me at least ), when the
auto-callback happens, I see a 'Dial' method call:

method call sender=:1.41 -> dest=org.ofono serial=112 path=/ril_0; 
interface=org.ofono.VoiceCallManager; member=Dial
   string "6174480627"
   string ""

So, I suspect something is happening in telepathy-ofono, or telepathy
itself to trigger this behavior.

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https://bugs.launchpad.net/bugs/1226739

Title:
  Ubuntu phone calls back automatically

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