diff --git a/rules/singbox/Wifi_Call_HK.json b/rules/singbox/Wifi_Call_HK.json
new file mode 100644
index 0000000..0e3bee3
--- /dev/null
+++ b/rules/singbox/Wifi_Call_HK.json
@@ -0,0 +1,14 @@
+{
+  "version": 1,
+  "rules": [
+    { 
+      "domain_suffix": [
+        "csl.prod.ondemandconnectivity.com"
+        "hhk.prod.ondemandconnectivity.com"
+        "epdg.epc.mnc000.mcc454.pub.3gppnetwork.org"
+        "ss.epdg.epc.mnc000.mcc454.pub.3gppnetwork.org"
+        "ss.epdg.epc.geo.mnc000.mcc454.pub.3gppnetwork.org"
+      ]
+    }
+  ]
+}