fixed some essential segfaults happening under heavy load. Added a bit more...

 fixed some essential segfaults happening under heavy load. Added a bit more error handling if we receive wrong data form mISDN (e.g. if we crashed before => handle_err() ). Added first steps to implement the parseing of the connected party number.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@17404 65c4cc65-6c06-0410-ace0-fbb531ad65f3