It's okay to send RINGING > 1 time, and don't try to send it in-band

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2537 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -1412,7 +1412,7 @@ static int sip_indicate(struct ast_channel *ast, int condition)
 	switch(condition) {
 	case AST_CONTROL_RINGING:
 		if (ast->_state == AST_STATE_RING) {
-			if (!p->progress && !p->ringing) {
+			if (!p->progress) {
 				transmit_response(p, "180 Ringing", &p->initreq);
 				p->ringing = 1;
 				break;