add some device function callbacks

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4471 43c1dc8c-776e-4df2-8ef1-6e829299be21
add some device function callbacks

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4472 43c1dc8c-776e-4df2-8ef1-6e829299be21