fixes #237; asterisk introduces a none codec that kills asterisk translation path whereas there a valid codec after the none

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5770 43c1dc8c-776e-4df2-8ef1-6e829299be21
references #237; remove debug notice output

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5771 43c1dc8c-776e-4df2-8ef1-6e829299be21