Updating Fields Changed in Core Manage and Mobility
Some fields of the existing activities cannot be updated by the Inbound Interface, if they have been previously changed in Core Manage and/or Mobility. This prevents the update from erasing the changes made by the user. Also, when an activity is created using the Core Manage or Mobility user interface, all the listed fields are considered as updated by user and, therefore, cannot be updated through Inbound API.
These fields are:
'reminder_time'
'language'
'time_zone'
'phone'
'email'
'cell'
'name'
'address'
'city'
'zip'
'state'
time_slot_id'
'sla_window_start'
'sla_window_end'
'service_window_start'
'service_window_end'