diff --git a/src/server.py b/src/server.py
index 3948223..6745608 100644
--- a/src/server.py
+++ b/src/server.py
@@ -322,6 +322,10 @@ async def call_tool(name: str, arguments: Any) -> List[TextContent | ImageConten
         # 3. Compare
         unregistered = []
         for s in router_secrets:
+            # Filter only PPPoE service (exclude 'any' and others)
+            if s.get('service') != 'pppoe':
+                continue
+                
             s_name = s.get('name')
             if s_name and s_name not in billing_users:
                 unregistered.append(f"{s_name} (Profile: {s.get('profile', '?')})")