* nta: when in UAS mode, respond to CANCEL and INVITE with same tag
Added mreply(), internal function for responding to a request message
Also, tag INVITE before responding to CANCEL.
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9291 d0543943-73ff-0310-b7d9-9358b9ac24b2