Im running FPBX 4.4.9 and in the Call Detail Records app im trying to search by "Caller Number" however it doesnt work, does everybody else have this issue or know if there is a fix available?
If it doesn't work then its unlikely there will be a fix until the next major release. The stable branch only receives security updates mainly. There has been extensive work done on CDRs within the master branch. You may want to spin up a master and check if it works in that.