diff --git a/config/mml/subscriber/udm_sub_mml_config.yaml b/config/mml/subscriber/udm_sub_mml_config.yaml
index 5e32db94..a624dcae 100644
--- a/config/mml/subscriber/udm_sub_mml_config.yaml
+++ b/config/mml/subscriber/udm_sub_mml_config.yaml
@@ -211,8 +211,7 @@ udm:
             comment: ""
           - name: "static_ip"
             type: "string"
-            value: "-"
-            optional: "false"
+            optional: "true"
             filter: ""
             display: "4G Static IP"
             comment: "Specify mobile phone static IP address, and '-' indicates the use of dynamic IP address"            
@@ -452,8 +451,7 @@ udm:
             comment: ""
           - name: "static_ip"
             type: "string"
-            value: "-"
-            optional: "false"
+            optional: "true"
             filter: ""
             display: "4G Static IP"
             comment: "Specify mobile phone static IP address, and '-' indicates the use of dynamic IP address"