Note: If you are upgrading from 5.x/6.0.x/7.0.x ...
Before upgrading to Release 7.1.0 release, the user you must not have no sessions in the /var/log/sonus/evlog/ or /var/log/sonus/evlog/evlog/ directories.
(This Note does not apply if you are upgrading from 6.2.2, 7.1.0 or later versions.)