diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d340115e4a..6e825b0074 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -7334,6 +7334,7 @@ static struct sip_pvt *find_call(struct sip_request *req, struct ast_sockaddr *a
 		}
 		/* reject requests that must always have a To: tag */
 		if (ast_strlen_zero(totag) && (req->method == SIP_ACK || req->method == SIP_BYE || req->method == SIP_INFO )) {
+			transmit_response_using_temp(callid, addr, 1, intended_method, req, "481 Call leg/transaction does not exist");
 			ast_debug(5, "%s must have a to tag. dropping callid: %s from: %s\n", sip_methods[req->method].text , callid, from );
 			return NULL;
 		}