Configure SIP security mode

When Lync connects to the server, it supports various authentication mechanisms. This policy allows the user to specify whether Digest and Basic authentication are supported.

Disabled (default): NTLM/Kerberos/TLS-DSK/Digest/Basic
Enabled:
Authentication mechanisms: NTLM/Kerberos/TLS-DSK
Gal Download: Requires HTTPS if user is not logged in as an internal user.

Supported on: At least Windows 7

Registry Hive	HKEY_LOCAL_MACHINE
Registry Path	software\policies\microsoft\office\15.0\lync
Value Name	enablesiphighsecuritymode
Value Type	REG_DWORD
Enabled Value	1
Disabled Value	0

lync15.admx

Administrative Templates (Computers)

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