[Freeswitch-users] attended transfer to rxfax

Hi How can I implement this: user calls to a number which starts sending fax after user presses 1 (channel A) after user hears fax signaling starts to attended transfer to a local extension which executes rxfax (Channel B) after user hears local extension rxfax signaling presses transfer to complete the transfer but no fax is received!! I trace logs and see that channel B ends after user presses transfer. it seems I need to create a C channel which is running txfax but I donno how to do it