Fix compiling without-conference  (references #74)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4384 43c1dc8c-776e-4df2-8ef1-6e829299be21
fixes 'undefined symbol: sccp_conference_create', references #73, sf: 'https://sourceforge.net/p/chan-sccp-b/bugs/176/'

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4385 43c1dc8c-776e-4df2-8ef1-6e829299be21
use enum for soft switch action; remove default from switch, to get a warnig when some action is not implemented

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4386 43c1dc8c-776e-4df2-8ef1-6e829299be21
use enum for soft switch action; remove default from switch, to get a warnig when some action is not implemented

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4387 43c1dc8c-776e-4df2-8ef1-6e829299be21
Unused function. fixes #68

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4388 43c1dc8c-776e-4df2-8ef1-6e829299be21