Rename a couple variables, to be consistent with the rest of the functions

Abstract out some common code into a single function

With the recent scheduler "issues", it pointed out a few things I might have been missing,
  so I added some rudimentary vrtp and rtcp stuff

General cleanup...


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@37629 65c4cc65-6c06-0410-ace0-fbb531ad65f3