Okay just an update thanks again to you both for helping me with this. So I did compile fully the whole freepbx build on centos7 from start to finish and the compiled chan_sip.c file was still 4Mb in size. So it seems aparent to me that the freepbx distro is compiled a bit different than the manual build but it does build fine. So thanks for all the explanations and help to get that far.
Turns out after all that the patch didn't seem to work anyways. Any Avaya experts out there that might be able to help?
Thanks again all, great community that we have here! I appreciate the help as always.