Fix conference refcount

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4302 43c1dc8c-776e-4df2-8ef1-6e829299be21
Add function description/documentation to conference

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4303 43c1dc8c-776e-4df2-8ef1-6e829299be21
Update codec setting for ast110 and astTrunk (references #44)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4304 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fixes conference when using asterisk-trunk (fixes #44)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4305 43c1dc8c-776e-4df2-8ef1-6e829299be21