[Serusers] audio and auth problems?

Hi Folks, I have 2 questions, I'm using openser 1.1.x and rtpproxy bridging between 2 networks, one public, one private. a pstn gateway in the private network, and clients in the public network. firstly, when I make a call check_from() fails, unless I comment it out, why is this? # if(!check_from()) # { # sl_send_reply("403", "Spoofed From-URI Detected"); # exit; # } and secondly. I have rtpproxy and openser listening on both public and private interfaces, with mhomed=1 set. whenever I make a call, everything works ok, but I have no audio? where should I look? -Cheers Max