[Freeswitch-users] Crazy Cause Code with "INVALID PROFILE"

So im doing some integration testing, I am sending a call to sofia profile A , and its routed out profile B. if I take profile B down, I can see freeswitch logs "mod_sofia.c:4417 Invalid Profile", which is fine.. the profile is stopped. but what I did not expect is that Freeswitch responds ( on profile A ) with : SIP/2.0 502 Bad Gateway Reason: SIP;cause=611;text="INVALID_PROFILE" which isnt even listed in https://freeswitch.org/confluence/display/FREESWITCH/Hangup+Cause+Code+Table as a valid hangup cause !! What I want to know is, how can I make freeswitch send a Q850 cause 41 in this case ?? ( without patching mod_sofia :P ) -- Sincerely Jay