diff --git a/CHANGES b/CHANGES
index f367f46cfe..bd1ca67a7a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -50,6 +50,11 @@ Core
    Asterisk is compiled with the LOW_MEMORY compile time option enabled because
    the cache code does not exist.
 
+chan_sip
+------------------
+ * Calls to invalid extensions are now reported as an ACL failure security event
+   "no_extension_match".
+
 res_rtp_asterisk
 ------------------
  * The X.509 certificate used for DTLS negotation can now be automatically
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 2d20442d0b..e54997b0d4 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -26654,6 +26654,7 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, str
 					ast_log(LOG_NOTICE, "Call from '%s' (%s) to extension"
 						" '%s' rejected because extension not found in context '%s'.\n",
 						S_OR(p->username, p->peername), ast_sockaddr_stringify(&p->recv), decoded_exten, p->context);
+					sip_report_failed_acl(p, "no_extension_match");
 				}
 				break;
 			case SIP_GET_DEST_REFUSED: