diff --git a/src/pathcomp/frontend/service/algorithms/_Algorithm.py b/src/pathcomp/frontend/service/algorithms/_Algorithm.py
index ea54f77978057af9ca99c700b5d1c7a46ed934ae..0a0861a0e19dbce41861b67f3ac602b8ee9add64 100644
--- a/src/pathcomp/frontend/service/algorithms/_Algorithm.py
+++ b/src/pathcomp/frontend/service/algorithms/_Algorithm.py
@@ -176,13 +176,19 @@ class _Algorithm:
         service.service_id.context_id.context_uuid.uuid = context_uuid
         service.service_id.service_uuid.uuid = service_uuid
         service.service_type = service_type
+        rules_nb = len(config_rules)
 
-        if service_type == ServiceTypeEnum.SERVICETYPE_L2NM:
+        if service_type == ServiceTypeEnum.SERVICETYPE_L2NM and rules_nb == 0:
             compose_l2nm_config_rules(config_rules, service.service_config.config_rules)
-        elif service_type == ServiceTypeEnum.SERVICETYPE_L3NM:
+            self.logger.info("Installing default rules for L2NM service")
+            pass
+        elif service_type == ServiceTypeEnum.SERVICETYPE_L3NM and rules_nb == 0:
             compose_l3nm_config_rules(config_rules, service.service_config.config_rules)
-        elif service_type == ServiceTypeEnum.SERVICETYPE_TAPI_CONNECTIVITY_SERVICE:
+            self.logger.info("Installing default rules for L3NM service")
+            pass
+        elif service_type == ServiceTypeEnum.SERVICETYPE_TAPI_CONNECTIVITY_SERVICE and rules_nb == 0:
             compose_tapi_config_rules(config_rules, service.service_config.config_rules)
+            self.logger.info("Installing default rules for TAPI service")
         else:
             MSG = 'Unhandled generic Config Rules for service {:s} {:s}'
             self.logger.warning(MSG.format(str(service_uuid), str(ServiceTypeEnum.Name(service_type))))
@@ -208,6 +214,8 @@ class _Algorithm:
             service.timestamp.CopyFrom(tuple_service[1].timestamp)
             for constraint in tuple_service[1].service_constraints:
                 service.service_constraints.add().CopyFrom(constraint)
+            for config_rule in config_rules:
+                service.service_config.config_rules.add().CopyFrom(config_rule)
 
         return service