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`BEFORE THE PATENT TRIAL AND APPEAL BOARD
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`:
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`Case No.:
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`Attorney Docket No. 017748.0345
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`In re US. Patent No. 8,542,815
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`Inventors: Clay Perreault et al.
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`Filed: March 1, 2010
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`Issued: September 24, 2013
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`Title: Producing Routing Messages for Voice
`over IP Communications '
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`Mail Stop PATENT BOARD
`Patent Trial and Appeal Board
`US. Patent and Trademark Office
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`P.0. Box 1450
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`Alexandria, Virginia 22313-1450
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`PETITIONER’S POWER OF ATTORNEY
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`Petitioner AT&T Services, Inc. hereby appoints the following practitioners
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`as its attorneys to transact all business in the Unites States Patent and Trademark
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`Office associated with this Petition for Inter Partes review of US. Patent No.
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`8,542,815.
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`Samir A. Bhavsar (Reg. No. Brian Johnston (Reg. No. 69,041)
`41,617)
`Baker Botts L.L.P.
`Baker Botts L.L.P.
`2001 Ross Avenue, #700
`2001 Ross Avenue, #700
`Dallas, TX 75201
`Dallas, TX 75201
`Tel: 214-953-6629
`Tel:214—953—658_1
`Fax: 214-661—4629
`Fax: 214—661—4581
`brian.johnston@bakerbotts.com
`samir.bhavsar@bakerbotts.com
`I
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`_
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`Charles Yeh (Reg. No. 63,440)
`Baker Botts L.L.P.
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`
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`2001 Ross Avenue, #700
`Dallas, TX 75201
`Tel: 214- 953-6792
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`Fax: 214—661—4792
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`Charles. eh bakerbotts.com
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`Petitioner also grants a full power of attorney to practitioners associated with
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`the Customer Number 02-03 84 to transact all business in the United States Patent
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`and Trademark Office associated with the above identified inter partes review.
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`The individual signing below has the authority to execute this document on
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`behalf of Petitioner.
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`
`it '1 w
`Kefllie M. Johnson
`Assistant Vice President, Senior Legal Counsel — IP Litigation
`Petitioner AT&T Services, Inc.
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`Date
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