CANCEL should be treated hop-by-hop.

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)

core/AmB2BSession.h

@@ -308,6 +308,7 @@ class AmB2BCallerSession: public AmB2BSession
 
   // @see AmSession
   void onSessionStart(const AmSipRequest& req);
+  void onCancel();
 
   // @see AmB2BSession
   void terminateLeg();