This set of changes adds OSP support to chan_iax2.  However, I have modified
the patch a bit from what was submitted.  You now use the CHANNEL() function
to get and set the OSP token for IAX2.

(issue #8531, reported by and original patch by homesick, patch updated by me)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@61702 65c4cc65-6c06-0410-ace0-fbb531ad65f3