You support Microsoft Lync Server 2013 servers in your customer’s company network. All computers
in the network are members of an Active Directory Domain Services (AD DS) domain named
corp.contoso.com. The Session Initiation Protocol (SIP) domain name is contoso.com. You configure
the Autodiscover service to support external mobile device users. Mobile device users running
Windows Phone or Apple iOS report that they are unable to sign in to the Lync Mobile Client.
You verify that you are able to:
• Establish a telnet session from an external computer to host lyncdiscover.contoso.com on
port 80.
• Sign in to Lync by manually entering the URL
https://lync.contoso.com/Autodiscover/autodiscoverservice.svc/Root.
You need to ensure that external users running Windows Phone or Apple iOS are able to
automatically sign in to Lync. Which three steps should you perform in sequence? (To answer, move
the appropriate three actions from the list of actions to the answer area and arrange them in the
correct order.)

Answer: ABC

Explanation: