Jabber IM for iphone can't receive calls after more than 30' of innactive phone

[xaviferrer]

When users bring the Jabber IM for iphone to background and lock the iphone, after more than 30 min of being locked, the users can't receive calls in Jabber app. Anyone with this problem? 
Jabber version 10.6.1.205546

[darmckin]

Hi xaviferror, when this is happening, what does your call manager say the status is of this jabber client?  Are they still showing as registered?

[xaviferrer]

The status in CUCM appears as "unregistered" mode, until the app is re-opened again from the background, navigate in the menu in order to update the status and then the status of the profile becomes as "registered" again in the CUCM.

iOS version 8.3(12F70)

CUCM 10.5.1.10000-7

[xaviferrer]

I've been testing in different iphone v6 in order to replicate the issue and it happens again.

It seems to be a bug related with the permission of "UIRequiresPersistentWiFi" in the info.plist file or some roaming issue between WIFI/3g.

The problem is that I can't modify manually this parameter in all the customer's iphone and it's a must to move forward with this VIP estrategical project.