These functions were only defined if BUF_MUNGE was defined, but even if that symbol is defined there is not anyplace in the driver where these functions were then called. This has been in the code since rev 87 so this is most likely stale debugging code. Feel free to revert if this is actually used somewhere that is not apparent. Here is where the functions were originally added to the drivers: http://svnview.digium.com/svn/zaptel?view=revision&revision=87 Signed-off-by: Shaun Ruffell <sruffell@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9322 a0bf4364-ded3-4de4-8d8a-66a801d63aff