Merged revisions 316217 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r316217 | dvossel | 2011-05-03 13:59:06 -0500 (Tue, 03 May 2011) | 9 lines
  
  Never put the Require: timer header in an Invite.
  
  This has already been discussed and should have been resolved earlier.  View
  revsion 285565's log for more information about why it is important to not
  put timer in the Require header.
  
  (closes issue #18704)
  Reported by: mfrager
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@316218 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -10160,7 +10160,6 @@ static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, in
 		char se_hdr[256];
 		snprintf(se_hdr, sizeof(se_hdr), "%d;refresher=%s", p->stimer->st_interval,
 			strefresher2str(p->stimer->st_ref));
-		add_header(req, "Require", "timer");
 		add_header(req, "Session-Expires", se_hdr);
 		snprintf(se_hdr, sizeof(se_hdr), "%d", st_get_se(p, FALSE));
 		add_header(req, "Min-SE", se_hdr);