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-rwxr-xr-xchannels/chan_sip.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index aa0ae6075..ef26c29af 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -6755,6 +6755,7 @@ static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_
case 410: /* Gone */
case 400: /* Bad Request */
case 500: /* Server error */
+ case 503: /* Service Unavailable */
if (owner)
ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
break;