[Freeswitch-users] set error code for rejected max sessions

I limited the number of sessions accepted by my server by setting max-sessions: switch.conf.xml: ... <param name="max-sessions" value="53"/>. ... It works great but when it rejects a call it returns error code 503. I would like it to return code 486. I was able to accomplish this by changing sofia.c. It works but it seems like there is probably a better way. Is there a config setting or dial plan setting I should use instead? Thanks in advance