ooh323 and fax

Hello all!

I’m running Asterisk SVN-branch-1.8-r369579 with addon ooh323, spandsp and res_fax.
Now I try to receive path-through fax on Asterisk. Asterisk respond to CNG signal with SED only when I use ReceiveFax function. When I forward this call to some extension and pickup the phone asterisk write console strings:
res_rtp_asterisk.c:661 ast_rtp_dtmf_begin: Don’t know how to represent 'f’
res_rtp_asterisk.c:775 ast_rtp_dtmf_end_with_duration: Don’t know how to represent ‘f’

I wonder does ooh323 support fax detection and forwarding this call to ‘fax’ extension?
tried in ooh323.conf faxdetect=yes,both but nothing is changing…

Best regards