2010/5/27 Miklos Tirpak miklos@iptel.org:
Well, I think there is a major difference even with negative responses in case of parallel forking. t_reply() immediately sends back a final reply and cancels the pending branches. change_reply_status() affects only a single branch that may not win at the end.
Thanks for the clarification. It makes sense as if the proxy sends a final reply to the UAC it must terminate the pending branches.