Code review comment for lp:~boiko/telephony-service/fix_call_duration

Are there any related MPs required for this MP to build/function as expected? Please list: No
Is your branch in sync with latest trunk (e.g. bzr pull lp:trunk -> no changes): Yes
Did you perform an exploratory manual test run of your code change and any related functionality on device or emulator?: Yes
Did you successfully run all tests found in your component's Test Plan (https://wiki.ubuntu.com/Process/Merges/TestPlan/telephony-service) on device or emulator? Yes
If you changed the UI, was the change specified/approved by design? No UI changes.
If you changed the packaging (debian), did you subscribe a core-dev to this MP? No packaging changes.