We haven't done anything to support this. It conceptually could work in passthrough. What are you trying to do, just bridge this across a freeswitch or actually terminate it to something?

On Mar 6, 2015, at 9:11 AM, Regis M <regis.freeswitch.org@tornad.net> wrote:
Hi,

Does FS support RFC 4040 (https://tools.ietf.org/html/rfc4040) clearmode ?

"This document describes how to carry 64 kbit/s channel data
   transparently in RTP packets, using a pseudo-codec called
   "Clearmode".  It also serves as registration for a related MIME type
   called "audio/clearmode"."
Not found on wiki or confluence..

Regards,