diff --git a/CHANGES b/CHANGES
index 0a4f80922..a99de3aed 100644
--- a/CHANGES
+++ b/CHANGES
@@ -27,6 +27,11 @@ CLI Changes
  * The 'logger reload' command now supports an optional argument, specifying an
    alternate configuration file to use.
 
+CDR
+---
+ * The filter option in cdr_adaptive_odbc now supports negating the argument,
+   thus allowing records which do NOT match the specified filter.
+
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 1.6.2 to Asterisk 1.8 ----------------
 ------------------------------------------------------------------------------
diff --git a/cdr/cdr_adaptive_odbc.c b/cdr/cdr_adaptive_odbc.c
index f0b0e99bf..db19896f2 100644
--- a/cdr/cdr_adaptive_odbc.c
+++ b/cdr/cdr_adaptive_odbc.c
@@ -65,6 +65,7 @@ struct columns {
 	SQLSMALLINT nullable;
 	SQLINTEGER octetlen;
 	AST_LIST_ENTRY(columns) list;
+	unsigned int negatefiltervalue:1;
 };
 
 struct tables {
@@ -163,9 +164,16 @@ static int load_config(void)
 		/* Check for filters first */
 		for (var = ast_variable_browse(cfg, catg); var; var = var->next) {
 			if (strncmp(var->name, "filter", 6) == 0) {
+				int negate = 0;
 				char *cdrvar = ast_strdupa(var->name + 6);
 				cdrvar = ast_strip(cdrvar);
-				ast_verb(3, "Found filter %s for cdr variable %s in %s@%s\n", var->value, cdrvar, tableptr->table, tableptr->connection);
+				if (cdrvar[strlen(cdrvar) - 1] == '!') {
+					negate = 1;
+					cdrvar[strlen(cdrvar) - 1] = '\0';
+					ast_trim_blanks(cdrvar);
+				}
+
+				ast_verb(3, "Found filter %s'%s' for cdr variable %s in %s@%s\n", negate ? "!" : "", var->value, cdrvar, tableptr->table, tableptr->connection);
 
 				entry = ast_calloc(sizeof(char), sizeof(*entry) + strlen(cdrvar) + 1 + strlen(var->value) + 1);
 				if (!entry) {
@@ -180,6 +188,7 @@ static int load_config(void)
 				entry->filtervalue = (char *)entry + sizeof(*entry) + strlen(cdrvar) + 1;
 				strcpy(entry->cdrname, cdrvar);
 				strcpy(entry->filtervalue, var->value);
+				entry->negatefiltervalue = negate;
 
 				AST_LIST_INSERT_TAIL(&(tableptr->columns), entry, list);
 			}
@@ -403,10 +412,11 @@ static int odbc_log(struct ast_cdr *cdr)
 				 * is very specifically NOT ast_strlen_zero(), because the filter
 				 * could legitimately specify that the field is blank, which is
 				 * different from the field being unspecified (NULL). */
-				if (entry->filtervalue && strcasecmp(colptr, entry->filtervalue) != 0) {
+				if ((entry->filtervalue && !entry->negatefiltervalue && strcasecmp(colptr, entry->filtervalue) != 0) ||
+					(entry->filtervalue && entry->negatefiltervalue && strcasecmp(colptr, entry->filtervalue) == 0)) {
 					ast_verb(4, "CDR column '%s' with value '%s' does not match filter of"
-						" '%s'.  Cancelling this CDR.\n",
-						entry->cdrname, colptr, entry->filtervalue);
+						" %s'%s'.  Cancelling this CDR.\n",
+						entry->cdrname, colptr, entry->negatefiltervalue ? "!" : "", entry->filtervalue);
 					goto early_release;
 				}
 
diff --git a/configs/cdr_adaptive_odbc.conf.sample b/configs/cdr_adaptive_odbc.conf.sample
index c43b9a17e..9b2725b93 100644
--- a/configs/cdr_adaptive_odbc.conf.sample
+++ b/configs/cdr_adaptive_odbc.conf.sample
@@ -37,6 +37,8 @@
 ; Any filter specified MUST match exactly or the CDR will be discarded
 ;filter accountcode => somename
 ;filter src => 123
+; Negative filters are also now available
+;filter src != 456
 ;
 ; Additionally, we now support setting static values per column.  Reason
 ; for this is to allow different sections to specify different values for