Received February 1, 2002
From: "Frost, Thomas F (Tom), ALIPM" <[email protected]>

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

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