Problem in installing red5 in openfire 3.7.1

hello all

i am new in openfire . i install openfire 3.7.1 in my ubuntu 12.10 server and it work very well bout now i want add voice chat to my server .

i google a lot and find that red5 is a good plugin for this issue .

but when i copy red5.war to openfire/plugin directory and restart my open fire service no red5 plugin is available in my openfire console (my_IPAddrress:9090)

thank you

with best wishes