Per discussion with oej on IRC we need the actual IP address, not the
outbound proxy IP address, in the sa field. This change matches the already
existing code for all other uses of the outbound proxy setting.
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@188247 65c4cc65-6c06-0410-ace0-fbb531ad65f3