3Rosenberg. Traversal using relay NAT (TURN) [EB/OL]. http://www.jdrosen.net/midcom-turn.html.
4Rosenberg. Interactive connectivity establishment(ICE):A methodology for nettwork address translator (NAT) traversal for the session initiation protocol(SIP)[EB/OL], http://www.jdrosen.net/papers/draft-rosenberg-sipping-ice-00.html.
5Rosenberg. Examples of network address translation(NAT) and firewall traversal for the session initiation protocol(SIP) [EB/OL]. http://www.jdrosen.net/papers/ draft-rosenberg-sipping-nat-scenarios-02.html.
6Rosenberg, Schulzrinne. An extension to the session initiation protocol (SIP) for symmetric response routing [EB/OL]. http://www.ietf.org/html.charters/sip-charter.html.
