diff --git a/core/AmB2BSession.h b/core/AmB2BSession.h
index e19aeaee..3860abac 100644
--- a/core/AmB2BSession.h
+++ b/core/AmB2BSession.h
@@ -154,7 +154,7 @@ private:
     AmSipRequest invite_req;
 
     void relayEvent(AmEvent* ev);
-    void createCalleeSession();
+    virtual void createCalleeSession();
     int  reinviteCaller(const AmSipReply& callee_reply);
 
 public:
diff --git a/core/AmSession.h b/core/AmSession.h
index a9e5892f..a3236197 100644
--- a/core/AmSession.h
+++ b/core/AmSession.h
@@ -129,13 +129,15 @@ class AmSession : public AmThread,
     friend class AmSessionContainer;
     friend class AmSessionFactory;
 
-    // this is the call group - by default local tag
-    string callgroup;
   
 protected:
     AmSdp               sdp;
     AmRtpAudio          rtp_str;
 
+    /** this is the group the media is processed with 
+		- by default local tag */
+    string callgroup;
+
 public:
     AmSipDialog         dlg;
 
@@ -160,7 +162,7 @@ public:
     /**
      * @see AmEventHandler
      */
-    void process(AmEvent*);
+    virtual void process(AmEvent*);
 
     void addHandler(AmSessionEventHandler*);