Plivo uses offset-based pagination to list the resources.
For instance, if your search request has a result of 100 objects with limit = 10 and offset = 5, then Plivo will return objects with indices 51 through 60.
A limit on the number of phone numbers to be returned. limit can range between 1 and 20, and the default is 20.
A pagination cursor that denotes the number of objects by which the results should be offset.