Prevent generating false call logs (CDR's)

main/cdr.c

@@ -3524,6 +3524,20 @@ static void post_cdr(struct ast_cdr *cdr)
 			continue;
 		}
 
+		/*
+		 * When Asterisk receives an SIP-INVITE from an unknown source, a CDR is generated. The workaround below
+		 * is trying to skip this kind of CDR. Otherwise a large number of invalid CDRs will be generated.
+		 *
+		 * TODO: In future, SIP user agent will receive requests from the configured source(s) only, i.e. proxy
+		 * or registrar only. SIP request messages from unwanted sources will be dropped silently without any
+		 * further processing.
+		 */
+		if (strcasecmp(cdr->dcontext, "call_line") == 0 && strcasecmp(cdr->lastapp, "Goto") == 0 &&
+				cdr->disposition == AST_CDR_FAILED) {
+			ast_debug(1, "Skipping CDR because it might be caused by an incoming call from an unwanted source\n");
+			continue;
+		}
+
 		/* Modify CDR's */
 		AST_RWLIST_RDLOCK(&mo_list);
 		AST_RWLIST_TRAVERSE(&mo_list, i, list) {