Telfa Extractor functionality is covered by our Generic Extractor. Therefore as of today, January 20th, 2016, we won't be making any further improvements or updates on Telfa Extractor. As of February 20th, 2016, Telfa Extractor will be completely removed.
Here is an example on how to configure Generic Extractor for Telfa API.
Contact our support, if you need any assistance with migration to Generic Extractor.