Nortel Networks Statement about IPR in RFC 3489 Date: 14 January 2008 From: Michelle Lee Dear Sir, Nortel Networks Limited has an issued US patent no. 6,993,595, entitled "Address Translation Change Identification", that may be relevant to at least a portion of this proposed IETF RFC 3489 standard if approved and implemented: Title: STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs) Tag: RFC 3489 http://www.ietf.org/rfc/rfc3489.txt?number=3489 As understood, RFC3489 is identified as a proposed standard but will be obseleted by the proposed IETF Internet draft-ietf-behave-rfc3489bis-13, Session Traversal Utilities for (NAT) (STUN), if such draft is approved as the resulting IETF standard. My contact information is set out below. Kind Regards, Michelle Lee IP Counsel Nortel Networks Limited 5-195 The West Mall Toronto, Ontario Canada M9C 5K1 Fax: 905-863-1986 mleelaw@nortel.com