[Freeswitch-users] Announce position in queue

I found this code for adding position annoucement ability to fusionpbx. https://code.google.com/p/fusionpbx/issues/detail?id=658 can some one point me the steps to integrate it to my fpbx installation? it looks like the code files is replacing some original code , is that good? what about version updates, isnt it going to overwrite it? are there other , better options to acheive this? Im new to this so forgive my newbie questions, I find this list to be the only solution trying to learn fs and fusion, as the documentation is very limited. Thanks Shai