Please create a new issue with the problems you mentioned regarding the auto restore mode if you think there is an error in Kamailio.
About the other questions - the auto mode will work if the vsf and vst headers are in the message. No manual interventions are necessary.
About the changing of the user on the client side - it depends how it was exactly changed (e.g. including tags etc..). This scenario should be discussed on sr-users list, as the tracker is not the right place for discussions.

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