Fix T38 passthrough regression introduced by state changes.

(closes issue #12078)
Reported by: dimas
Patches:
      v1-12078.patch uploaded by dimas (license 88)
(closes issue #12074)
Reported by: Ivan


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@104533 65c4cc65-6c06-0410-ace0-fbb531ad65f3