diff --git a/core/AmB2BSession.cpp b/core/AmB2BSession.cpp
index c053fd45..f69ec88e 100644
--- a/core/AmB2BSession.cpp
+++ b/core/AmB2BSession.cpp
@@ -939,6 +939,15 @@ void AmB2BCallerSession::onSessionStart(const AmSipRequest& req)
   AmB2BSession::onSessionStart(req);
 }
 
+void AmB2BCallerSession::onCancel()
+{
+  if(dlg.getStatus() == AmSipDialog::Pending) {
+    terminateOtherLeg();
+    terminateLeg();
+    dlg.reply(invite_req, 487, "Request terminated");
+  }
+}
+
 void AmB2BCallerSession::connectCallee(const string& remote_party,
 				       const string& remote_uri,
 				       bool relayed_invite)
diff --git a/core/AmB2BSession.h b/core/AmB2BSession.h
index 11faa2e8..525e4bfa 100644
--- a/core/AmB2BSession.h
+++ b/core/AmB2BSession.h
@@ -308,6 +308,7 @@ class AmB2BCallerSession: public AmB2BSession
 
   // @see AmSession
   void onSessionStart(const AmSipRequest& req);
+  void onCancel();
 
   // @see AmB2BSession
   void terminateLeg();