This article is a brief update to the process previously documented for Lync Server 2010.
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Attempts to use 1.0.522.x versions would always fail with As older versions of firmware may still be in use or come pre-installed on new devices then there may exist a scenario where the devices are unable to successfully sign-in to a Lync Server 2013 environment (specifically OCS 2007 RTM versions).
And because the only way to update the Lync Phone Edition firmware is by the device requesting and downloading the package from the Lync Server then this appears to be a cyclic problem.
This little-known behavior is hardcoded into all firmware releases.
The phones are programmed to look for a specific hostname which is not typically included in the Lync topology, but if it is added manually to the environment then phones will be able to update without signing in.
The Device Out of Box section shown at the bottom of this page in Tech Net lists the requirements to support this registration-less device process.
A network capture run on the Lync server will show the following traffic indicating that the phone has requested to establish a TLS session with the Lync Server, which then passes its server certificate to the phone in the following message.
Microsoft continues to release semi-quarterly Cumulative Updates of firmware for the various LPE models.
In the round of releases in December 2012 and January 2013 (aka CU7) official support for Lync Server 2013 was added, as well dropping the ‘2010’ from the previous name of .
The registration does not need to actually succeed so if the phone is running a vey old version incapable of registering to the Lync server for some reason, or an invalid PIN is used simply to speed up the process it does not matter.