Call record is missing after you answer the call on a locked Lync Phone Edition device

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Symptoms

Consider the following scenario:

You sign in to a device that is running Microsoft Lync Phone Edition. The device is not connected to a computer.
You lock the device.
You answer an incoming call by using the device.

In this scenario, a record of the call is missing from the call logs of the device.

To resolve this issue, install one of the following cumulative update:

2889241 Description of the cumulative update for Lync Phone Edition for Aastra 6721ip and Aastra 6725ip: October 2013
2889243 Description of the cumulative update for Lync Phone Edition for HP 4110 and HP 4120: October 2013
2889244 Description of the cumulative update for Lync Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 telephones: October 2013
2889246 Description of the cumulative update for Lync Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000 telephones: October 2013