Attempting to use channel 16 on E1 CAS is disallowed since that channel is reserved for RBS signaling. Configurations should not be generated that attempt to use it. Closes DAHDI-763. Patch by dmartinez. Merged revisions 9485 via svnmerge from http://svn.digium.com/svn/dahdi/tools/trunk git-svn-id: http://svn.astersk.org/svn/dahdi/tools/branches/2.4@9741 17933a7a-c749-41c5-a318-cba88f637d49