The Sangoma A101 board support "hardware fax detection". It configured in /etc/wanpipe/wanpipe1.conf configureation file.

TDMV_HW_FAX_DETECT = YES # YES: receive fax 1100hz events from hardware

Is there any configuration on the dial plan, if detect the fax, goes to the predefined dial plan context.

something the same in asterisk http://wiki.sangoma.com/wanpipe-linux-asterisk-fax-detect

Thanks!