When traversing the queue of frames for possible retransmission after

receiving a VNAK, handle sequence number wraparound so that all frames that 
should be retransmitted actually do get retransmitted.
(issue #10227, reported and patched by mihai)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@75757 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -6033,7 +6033,7 @@ static void vnak_retransmit(int callno, int last)
 	while(f) {
 		/* Send a copy immediately */
 		if ((f->callno == callno) && iaxs[f->callno] &&
-			(f->oseqno >= last)) {
+			((unsigned char ) (f->oseqno - last) < 128)) {
 			send_packet(f);
 		}
 		f = f->next;