Changes to List current (live) calls

added the non-success response with the status 415

the request property advanced became not nullable

the request property advanced/groups became not nullable

the request property advanced/ivrs became not nullable

the request property advanced/ivrs/items/numbers became not nullable

the request property advanced/ivrs/items/scenarios became not nullable

the request property advanced/users became not nullable

the request property direction became not nullable

the request property interface became not nullable

the request property limit_count became not nullable

the request property limit_offset became not nullable

the request property status became not nullable

the current_calls_list/items/creation_date response's property format changed from date to date-time for status 200

api operation id postCallsCurrent was added