Call Back -- Enqueue

Requests a call back to a given number by an operator in a given call center. The call back is added to the queue for the call center like a regular call, and a call is initiated when the next operator becomes available. This API respects all existing call center settings,
e.g. business / holiday hours and queue settings. This API currently does not allow international call backs. Duplicate call backs for a given number and call center are not allowed. Specific error messages will be provided in case of failure.

Added on Dec 9, 2019 for API v2.

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