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V-238107

CAT II (Medium)

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

Rule ID

SV-238107r1043178_rule

STIG

Microsoft Skype for Business 2016 Security Technical Implementation Guide

Version

V2R1

CCIs

CCI-001184

Discussion

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

Check Content

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

Procedure: Use the Windows Registry Editor to navigate to the following key: 

HKLM\Software\Policies\Microsoft\office\16.0\lync

Criteria: If the value disablehttpconnect is REG_DWORD = 1, this is not a finding.

Fix Text

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".