In a previous post, we discussed resigning certificates with SHA-2:
Some users raised a concern about the SHA-2 supportability for Lync Phone Edition. This support (SHA-2) was included in the December 2015 update for Lync Phone Edition:
This update for Microsoft Lync Phone Edition devices adds support for the SHA-2 suite of digest hash and signing algorithms for connections from clients. The SHA-2 protocol uses digest lengths of 224, 256, 384, or 512 bits. After you apply this update, Lync Phone Edition devices can be connected to a Microsoft Lync server that contains a certificate that is issued from the same Certification Authority (CA).
This update was released for the following devices:
In order to check the previous list of releases, go to: