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