Merged revisions 170504 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r170504 | file | 2009-01-23 14:04:08 -0400 (Fri, 23 Jan 2009) | 4 lines
  
  Use the on hold flag to see if the call is on hold or not. It is possible that our address for them will still be valid even though they are on hold.
  (closes issue #14295)
  Reported by: klaus3000
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@170505 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -21025,7 +21025,7 @@ static void check_rtp_timeout(struct sip_pvt *dialog, time_t t)
 		/* Might be a timeout now -- see if we're on hold */
 		struct sockaddr_in sin;
 		ast_rtp_get_peer(dialog->rtp, &sin);
-		if (sin.sin_addr.s_addr || (ast_rtp_get_rtpholdtimeout(dialog->rtp) &&
+		if (!ast_test_flag(&dialog->flags[1], SIP_PAGE2_CALL_ONHOLD) || (ast_rtp_get_rtpholdtimeout(dialog->rtp) &&
 		     (t > dialog->lastrtprx + ast_rtp_get_rtpholdtimeout(dialog->rtp)))) {
 			/* Needs a hangup */
 			if (ast_rtp_get_rtptimeout(dialog->rtp)) {