chan_sip: Revert r398835 due to failing tests involving originate

(issue ASTERISK-22424)
Reported by: Jonathan Rose
........

Merged revisions 398977 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@398986 f38db490-d61c-443f-a65b-d21fe96a405b