diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index c803fc6545..75e4bb589f 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -19478,6 +19478,10 @@ static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, str
 		}
 
 		transmit_response(p, "200 OK", req);
+	} else if (!strcmp(event, "keep-alive")) {
+		 /* Used by Sipura/Linksys for NAT pinhole,
+		  * just confirm that we recieved the packet. */
+		transmit_response(p, "200 OK", req);
 	} else {
 		/* We don't understand this event. */
 		transmit_response(p, "489 Bad event", req);