App_conference patch and asterisk 1.6.2.x


I’m searching a patch for app_conference and asterisk 1.6.2.x. Asterisk 1.6.0.x and asterisk 1.6.1.x have a little bug on SDP protocol and don’t allow videocall so app_conference don’t work. Where can I found a patch? or How can I make a patch?
I have studied the patch for asterisk 1.6.0.x and i have saw that it make change on 3 files:
makefile ->only a line
app_conference.h ->only a line
cli.c ->about 40 line

Thank you very much for your help!