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You need to configure the Lync 2013 environment to meet the technical requirements for push notifications for mobile users. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A. Configure a web publishing rule for port 80 on the reverse proxy for the acquired domain.
B. Configure CNAME redirection over HTTPS for the acquired domain.
C. open port 5223 on the Enterprise Wi-Fi network.
D. Open port 23457 on the Enterprise Wi-Fi network.
Correct Answer: AC
Explanation/Reference:
Mobile device clients do not support multiple Secure Sockets Layer (SSL) certificates from different domains. Therefore, CNAME redirection to different domains is not supported over HTTPS. For example, a DNS CNAME record for lyncdiscover.contoso.com that redirects to an address of director.contoso.net is not supported over HTTPS. In such a topology, a mobile device client needs to use HTTP for the first request, so that the CNAME redirection is resolved over HTTP. Subsequent requests then use HTTPS. To support this scenario, you need to configure your reverse proxy with a web publishing rule for port 80 (HTTP).
If you support push notifications and want Apple mobile devices to receive push notifications over your Wi-Fi network, you also need to open port 5223 on your enterprise Wi-Fi network. Port 5223 is an outbound TCP port used by the Apple Push Notification Service (APNS).
From scenario: All push notifications must be able to be sent mobile clients on all supported cell phone manufactures. Many users do not use Windows mobile phones.
Ref: http://technet.microsoft.com/en-gb/library/hh690030.aspx
