IVR sorting by direction, duration, and end date.

https://trello.com/c/glysPBRD/

In IVR Call logs, implemented sorting by call direction,
call duration, and end date, so that when the column headers
for these fields are clicked in the UI, the call logs will
be sorted by the appropriate field.

Change-Id: I5f9e63ff1eede2b8086eae9ed67ffe763d45921f