An asterisk * in the title indicates the field is mandatory.
If a field has a default value, it is shown in the Description column.
If the field type is an array, the Field Name has a .[n] suffix, where n is the array index placeholder.
Object and array field names are listed to provide context. If a field belongs to an object or an array, the full field name is shown in dot separated notation.

Title		Description	Details
	Usage	Contains a list of allowable usage strings. These entries can be any string value.	Field Name: Usage.[n] Type: Array
Identity		The level at which these settings are applied. The only identity that can be applied to PSTN usages is Global.	Field Name: Identity Type: String
Anchor			Field Name: Anchor Type: String
ScopeClass			Field Name: ScopeClass Type: String
Element			Field Name: Element Type: String

Model: device/skypeforbusiness/CsPstnUsage