(closes issue #13563)

(closes issue #13563)
Reported by: mnicholson
Patches:
      found1.diff uploaded by mnicholson (license 96)

This patch was mainly meant to apply to trunk and 1.6.x,
but I'm applying it to 1.4 also, which should be a perfectly
harmless fix to the vast majority of users who are not using
external switches, but the few who might be affected
will not have to go to the pain of filing a bug report.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@144677 65c4cc65-6c06-0410-ace0-fbb531ad65f3