T38 Fax: RFC 4612-Optional Parameters

Does Asterisk supports following T38 coding methods:
T38FaxFillBitRemoval
T38FaxTranscodingMMR
T38FaxTranscodingJBIG

In my test bed, Asterisk receives above T38 parameters from far end. However Asterisk is not forwarding it to the Fax client. Please confirm.

Hello again.,
Does Asterisk supports fallback from Super G3 Fax to G3 Fax?