Fix IAX2 registration time. We want to set reg->refresh to the new value only if its lower not if its higher. (bug 1955)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3369 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -4035,7 +4035,7 @@ static int iax2_ack_registry(struct iax_ies *ies, struct sockaddr_in *sin, int c
 	}
 	memcpy(&reg->us, &us, sizeof(reg->us));
 	reg->messages = ies->msgcount;
-	if (refresh && (reg->refresh < refresh)) {
+	if (refresh && (reg->refresh > refresh)) {
 		/* Refresh faster if necessary */
 		reg->refresh = refresh;
 		if (reg->expire > -1)