[reSIProcate] About onRefer(InviteSessionHandle, ServerSubscriptionHandle, const SipMessage& msg);

[常铮]

A send REFER to B by calling 
    mInviteSessionHandle->refer(*ReferTo);

and then B will call      
    virtual void onRefer(InviteSessionHandle, ServerSubscriptionHandle, const SipMessage& msg);

But now, I notice that the memory address of InviteSessionHandle and ServerSubscriptionHandle are same.
Is it right?

Thank you!

John
Beijing China