2012-09-19 11:42:53.768237 [ERR] sofia.c:2491 Error Creating SIP UA for
profile: internal

This is frequently a case of something else already using port 5060. Check out this page for tips on finding out what is using that port:
http://wiki.freeswitch.org/wiki/Sofia-SIP#What_if_these_commands_don.27t_work_for_me.3F

-MC