When login with jabber for Iphone TCT gets registered with cucm. But when close the app and reopen it it need to sign in again. TCT remain registered. This works well with BOTs. No need to sign in again. Only with TCT.
IOS in iphone disables the jabber Network connection Once IT IS minimized. IT should stay running on background Android after the app Is called again IT should reconnect automatic ally. That Washington working in iOS 11 IT happened that your missed some messages when apns not enabled
Yes. I have found out that APPLE has introduce APN (apple push notification) and removed the necessary sockets which monitors jabber when it is availble on foreground. There is a guide to configure apple push notification ( https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/configAdminGuide/12_0_1/cup0_b_config-admin-guide-imp-1201/cup0_b_config-admin-guide-imp-1201_chapter_011001.html )
I am configuring it and will see how it goes. !!