Note that direct T.38 is not supported.

(closes issue #16411)
Reported by: stanusr
Patches:
      __20091210-sip.conf.sample-documentation.txt uploaded by lmadsen (license 10)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@239520 65c4cc65-6c06-0410-ace0-fbb531ad65f3