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-rw-r--r--channels/chan_iax2.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index ad120dbdc..3351d81f9 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -6710,7 +6710,9 @@ static int socket_read(int *id, int fd, short events, void *cbdata)
if (option_debug)
ast_log(LOG_DEBUG, "Packet arrived out of order (expecting %d, got %d) (frametype = %d, subclass = %d)\n",
iaxs[fr->callno]->iseqno, fr->oseqno, f.frametype, f.subclass);
- if (iaxs[fr->callno]->iseqno > fr->oseqno) {
+ /* Check to see if we need to request retransmission,
+ * and take sequence number wraparound into account */
+ if ((unsigned char) (iaxs[fr->callno]->iseqno - fr->oseqno) < 128) {
/* If we've already seen it, ack it XXX There's a border condition here XXX */
if ((f.frametype != AST_FRAME_IAX) ||
((f.subclass != IAX_COMMAND_ACK) && (f.subclass != IAX_COMMAND_INVAL))) {