Nortel Networks Second Update to Nortel Networks Statement about IPR in RFC 3489 Date: 20 March 2008 From: Lee, Michelle Dear Sir, Please consider this a revised update to and replacement of Nortel Networks Statement about IPR in RFC 3489 (ID#937). As identified in its IPR disclosure ID#918, 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 If and to the extent claims of U.S. patent no. 6,993,595 cover and are necessary to practice the resulting IETF RFC 3489 standard as approved, further to Nortel Networks Statement IPR ID#918, Nortel Networks is willing to make available licenses on fair, reasonable, reciprocal, and non-discriminatory terms under such necessary claims of this patent for compliance with the resulting approved IETF RFC 3489 standard. Requests may be addressed to: Mark Hearn Nortel Networks 2221 Lakeside Boulevard, M/S 991/14/B20 Richardson, Texas 75082 USA hearnm@nortel.com 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