Received February 1, 2002
From: "Frost, Thomas F (Tom), ALIPM" <tfrost@att.com>

This declaration is being made pursuant to the provisions of IETF IPR 
Policy, Sections 10.3.1 and 10.3.2.

This is to advise the IETF that AT&T believes it owns intellectual property 
that may relate to Internet Draft document " draft-ietf-sip-rfc2543bis-06", 
including United States Patent No. 6,324,279.  To the extent that the 
technology discussed in this Internet Draft becomes an IETF Standard, and 
to the extent claims of AT&T's patents are required to implement the IETF 
Standard, AT&T agrees that, upon written request, AT&T will offer, on a 
nondiscriminatory basis, non-exclusive licenses on fair and reasonable
terms under such patent claims to implement that IETF Standard. AT&T's 
willingness to grant such licenses is conditioned upon the prospective 
licensee granting a reciprocal license to AT&T under any patents that the 
prospective licensee has to any technology required to implement that IETF 
Standard.

Written requests for licenses may be sent to:

AT&T Intellectual Property Licensing
Intellectual Property Vice President
180 Park Avenue
Florham Park, NJ 07932