diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 29916b7414..a9d658b462 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -11341,7 +11341,7 @@ static int handle_request(struct sip_pvt *p, struct sip_request *req, struct soc
 	}
 
 	if (!e && (p->method == SIP_INVITE || p->method == SIP_SUBSCRIBE || p->method == SIP_REGISTER)) {
-		transmit_response(p, "503 Server error", req);
+		transmit_response(p, "400 Bad request", req);
 		ast_set_flag(p, SIP_NEEDDESTROY);
 		return -1;
 	}