diff --git a/callagent/SIPCallAgent.st b/callagent/SIPCallAgent.st
index 47f8987..1bc9c3f 100644
--- a/callagent/SIPCallAgent.st
+++ b/callagent/SIPCallAgent.st
@@ -37,6 +37,17 @@ SIPByeRequest extend [
     ]
 ]
 
+SIPOptionsRequest extend [
+    sipDispatchNewDialog: aDialog on: aUserAgent [
+        <category: 'OsmoSIP-Callagent'>
+        aUserAgent
+            respondWith: 481
+            phrase: 'Call Leg/Transaction Does Not Exist'
+            on: self
+            dialog: aDialog.
+    ]
+]
+
 Object subclass: SIPTransport [
     | queue handler |
     <category: 'OsmoSIP-Callagent'>