Can't use Bluetooth Headset during calls on MX4

[Seth]

OS Build Number
r257

Ubuntu Image Part
20160216

Ubuntu Build Description
Ubuntu 15.04 -armhf (20160216-020304)

Device Image Part
20160111-51982fc

Device Build Description
ARALE_MEIZU

Customization Image Part
1452441600

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dialer-app:
Installed: 0.1+15.04.20160107.1-0ubuntu1 0

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Expected: Able to use Bluetooth Headset during a call
Result: Microphone and speaker on the headset do not work. The hangup button works.

I have been able to use this headset in the past, but last month, after updates, the headset has stopped working during calls. I have tried two other older bluetooth headsets that previously worked and they have failed as well. All headsets work correctly with the Music and CuteSpotify app.

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Error:

From file /home/phablet/.cache/upstart/application-legacy-dialer-app-.log:
void CallManager::onCallEnded()
ubuntumirclient: Got invalid serialized mime data. Ignoring it.
tp-qt 0.9.6.1 WARN: Properties specified in 0.17.6 not found
tp-qt 0.9.6.1 WARN: Handle owners and self handle tracking disabled
tp-qt 0.9.6.1 WARN: Properties specified in 0.17.6 not found
tp-qt 0.9.6.1 WARN: Handle owners and self handle tracking disabled
tp-qt 0.9.6.1 WARN: Properties specified in 0.17.6 not found
tp-qt 0.9.6.1 WARN: Handle owners and self handle tracking disabled
qml: Starting a call to [phone] ---------------------#(I anonymized the number. I call this number often and it works fine)
The phone number is not a valid number: ""
file:///usr/share/dialer-app/LiveCallPage/LiveCall.qml:143:5: QML Connections: Cannot assign to non-existent property "onCallHoldingFailed"
file:///usr/share/dialer-app/LiveCallPage/LiveCall.qml:390:23: Unable to assign [undefined] to QList<int>
file:///usr/share/dialer-app/LiveCallPage/LiveCall.qml:389:23: Unable to assign [undefined] to QList<int>
ubuntumirclient: Got invalid serialized mime data. Ignoring it.
tp-qt 0.9.6.1 WARN: Properties specified in 0.17.6 not found
tp-qt 0.9.6.1 WARN: Handle owners and self handle tracking disabled
tp-qt 0.9.6.1 WARN: Properties specified in 0.17.6 not found
tp-qt 0.9.6.1 WARN: Handle owners and self handle tracking disabled
tp-qt 0.9.6.1 WARN: Properties specified in 0.17.6 not found
tp-qt 0.9.6.1 WARN: Handle owners and self handle tracking disabled
QObject::killTimer: Timers cannot be stopped from another thread
QObject::startTimer: Timers cannot be started from another thread

From Bluez:

From file /home/phablet/.cache/upstart/bluez-mpris-proxy.log:
org.bluez appeared
Bluetooth Adapter /org/bluez/hci0 found
player core.ubuntu.media.Service at :1.43 found
org.bluez appeared
Bluetooth Adapter /org/bluez/hci0 found
player core.ubuntu.media.Service at :1.42 found
Bluetooth Transport /org/bluez/hci0/dev_E3_28_E9_20_3D_56/fd0 found