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In the event a secure Session Initiation Protocol (SIP) connection fails, the connection must be restricted from resorting to the unencrypted HTTP.

An XCCDF Rule

Description

Prevents from HTTP being used for SIP connection in case TLS or TCP fail.

ID
SV-85529r1_rule
Version
DTOO422
Severity
Medium
References
Updated

Remediation Templates

A Manual Procedure

Set the policy value for Computer Configuration -> Administrative Templates -> Skype for Business 2016 -> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" to "Enabled".