Index: channels/chan_sip.c  - Asterisk 1.8x
===================================================================
@@ Line change starting at: +16186 @@

if (sip_cfg.allowguest) {
                get_rpid(p, req);
                p->rtptimeout = global_rtptimeout;
                p->rtpholdtimeout = global_rtpholdtimeout;
                p->rtpkeepalive = global_rtpkeepalive;
                if (!dialog_initialize_rtp(p)) {
                        res = AUTH_SUCCESSFUL;
                } else {
                        res = AUTH_RTP_FAILED;

+		ast_log(LOG_NOTICE, "Unauthenticated call receiving from '%s' failed for '%s' - %s\n",
+	                        get_header(req, "To"), ast_sockaddr_stringify(addr),
+	                        reason);
+	                append_history(p, "RegRequest", "Failed : Account %s : %s", get_header(req, "To"), reason);   

                }
        } else if (sip_cfg.alwaysauthreject) {
                res = AUTH_FAKE_AUTH; /* reject with fake authorization request */

+		ast_log(LOG_NOTICE, "Unauthenticated call receiving from '%s' failed for '%s' - %s\n",
+	                        get_header(req, "To"), ast_sockaddr_stringify(addr),
+	                        reason);
+	                append_history(p, "RegRequest", "Failed : Account %s : %s", get_header(req, "To"), reason);   

        } else {
                res = AUTH_SECRET_FAILED; /* we don't want any guests, authentication will fail */

+		ast_log(LOG_NOTICE, "Unauthenticated call receiving from '%s' failed for '%s' - %s\n",
+	                        get_header(req, "To"), ast_sockaddr_stringify(addr),
+	                        reason);
+	                append_history(p, "RegRequest", "Failed : Account %s : %s", get_header(req, "To"), reason);   

        }