getDirectoryNumbers() for Salesforce Classic

Returns the list of phone numbers from the call center’s directory. This method is only available in API version 31.0 or later.

Name	Type	Description
`isGlobal`	boolean	Set to `true` to return directory numbers from the global call center, or `false` to return directory numbers specific to a call center.
`callCenterName`	string	Specifies the call center name on which to return directory numbers. If `isGlobal` is `false` and this field is not specified, all directory numbers are returned.
`callback`	function	JavaScript method executed when the API method call is completed.
`resultSetPage`	integer	Represents the page number of the list of results to return. This number starts at 0.
`resultSetPageSize`	integer	Sets the maximum number of phone numbers to retrieve. Defaults to 5000; maximum is 10000. If `hasNext` returns `true` in the `callback`, use this argument with `resultSetPage` to get the next page of results. For example, if `resultSetPageSize` is 5000 and `resultSetPage` is 0, the first 5000 phone numbers are returned; if `resultSetPage` is 1, the next 5000 are returned.

Name	Type	Description
`result`	string	Returns a JSON string that represents the list of phone numbers from the specified call center name. Each phone number element contains a call center name, phone, and description.
`error`	string	If the API call was successful, this variable is undefined. If the API call failed, this variable returns an error message.

Example result: