How to add bux fixed issues to old asterisk package?

hi
Is it possible to add bug fixed issues to asterisk 1.8.8.0 instead of updating asterisk 1.8.27.0 ??

how to get bux fix patch files??

1.8.27.0 is the bug fixed 1.8.8.0. If you install all the bug fixes you will be doing the equivalent of a full upgrade.

For a specific fix, you need to find the bug report, and get the attached patch file, or do an svn diff on the repository based on the revision in which it is fixed, then use patch to apply that against the source tree, resolve any conflicts and recompile. This is unlikely to be a reasonable course of action if you needed to ask about it.