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/branches/1.4@170504 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -16287,7 +16287,7 @@ restartsearch:
 					/* Might be a timeout now -- see if we're on hold */
 					struct sockaddr_in sin;
 					ast_rtp_get_peer(sip->rtp, &sin);
-					if (sin.sin_addr.s_addr || 
+					if (!ast_test_flag(&sip->flags[1], SIP_PAGE2_CALL_ONHOLD) || 
 					    (ast_rtp_get_rtpholdtimeout(sip->rtp) &&
 					     (t > sip->lastrtprx + ast_rtp_get_rtpholdtimeout(sip->rtp)))) {
 						/* Needs a hangup */