pbx_function.so not found and timeout error on 1.6.2

hi i have a problem when ever i use a timeout function it reports error. and i also dont have pbx_function.so in my asterisk. My question is is it necassary to have to pbx_function.so in asterisk,since i did not find it in my version 1.6.2 is it renamed or timeout function is implemented else where?
thanks in advance