Looking to create a device that answers a call and then pushes 9 to trigger my gate opening. The recording of the 9 tone no longer works after the call box was upgraded. I've seen some video on youtube about circuit boards that can be built but I have little experience with something like this. I think I could assemble the parts but wold be lost without an LCD interface walking me thru how to program something to answer after 4 rings then press the 9 tone. Any advice or parts to consider looking in to? this video seemed to be in the right direction