Hi
FatalXcept10n！
1.Do we need to set up a federation with sipfed.online.lync.com if we have no cloud-based subscriptions to Lync components of Office 365?
If you don’t have Lync components of Office 365, you cannot use push notification because push Notification requires a Lync or OCS Edge Server and Federation with Lync Online.
2.Do I need to open port 5223 TCP outbound on my firewall for push notifications to work?
In my research, if your devices connect to the push notification over Wi-Fi must have TCP port 5223 opened on any firewalls between the device and the Internet open. For more details, you can refer to:
https://ca-broadcom.wolkenservicedesk.com/external/article?articleId=48569
3.Are push notifications even needed with recent versions of iOS?
If you use Lync 2010 Mobile on Apple devices, push notification is an important consideration but if you use Lync 2013 Mobile on Apple devices, you no longer need push notification. You can refer the following
article to know more details:
https://docs.microsoft.com/en-us/lyncserver/lync-server-2013-configuring-for-push-notifications
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Best Regards,
Jimmy Yang
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