Merged revisions 282860 via svnmerge from

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

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  r282860 | mnicholson | 2010-08-19 15:01:11 -0500 (Thu, 19 Aug 2010) | 30 lines
  
  Merged revisions 282859 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r282859 | mnicholson | 2010-08-19 14:44:00 -0500 (Thu, 19 Aug 2010) | 23 lines
    
    Merged revisions 277944 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
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      r277944 | pabelanger | 2010-07-19 15:56:07 -0500 (Mon, 19 Jul 2010) | 16 lines
      
      Regression with T.38 negotiation
      
      Prior to 1.4.26.3 T.38 negotiation worked properly, in the case
      of the reporter.  
      
      (issue #16852)
      Reported by: cfc
      
      (closes issue #16705)
      Reported by: mpiazzatnetbug
      Patches:
            issue16705_2.diff uploaded by ebroad (license 878)
      Tested by: vrban, ebroad, c0rnoTa, samdell3
      
      Review: https://reviewboard.asterisk.org/r/754/
    ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@282861 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -8540,7 +8540,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 		ast_set_write_format(p->owner, p->owner->writeformat);
 	}
 	
-	if (ast_test_flag(&p->flags[1], SIP_PAGE2_CALL_ONHOLD) && !ast_sockaddr_isnull(sa) && (!sendonly || sendonly == -1)) {
+	if (ast_test_flag(&p->flags[1], SIP_PAGE2_CALL_ONHOLD) && (!ast_sockaddr_isnull(sa) || !ast_sockaddr_isnull(vsa) || !ast_sockaddr_isnull(tsa) || !ast_sockaddr_isnull(isa)) && (!sendonly || sendonly == -1)) {
 		ast_queue_control(p->owner, AST_CONTROL_UNHOLD);
 		/* Activate a re-invite */
 		ast_queue_frame(p->owner, &ast_null_frame);
@@ -8556,7 +8556,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 		if (sip_cfg.notifyhold)
 			sip_peer_hold(p, FALSE);
 		ast_clear_flag(&p->flags[1], SIP_PAGE2_CALL_ONHOLD); /* Clear both flags */
-	} else if (ast_sockaddr_isnull(sa) || (sendonly && sendonly != -1)) {
+	} else if ((ast_sockaddr_isnull(sa) && ast_sockaddr_isnull(vsa) && ast_sockaddr_isnull(tsa) && ast_sockaddr_isnull(isa)) || (sendonly && sendonly != -1)) {
 		int already_on_hold = ast_test_flag(&p->flags[1], SIP_PAGE2_CALL_ONHOLD);
 		ast_queue_control_data(p->owner, AST_CONTROL_HOLD,
 				       S_OR(p->mohsuggest, NULL),