TI Leads in Voice-Enabled Cable Modem 
with Industry's First SIP Technology Implementation

Telogy Networks' Software Powers Flexible DSP-Based VoIP Solution
Enables Switching Between Network Protocols

LOS ANGELES (December 15, 1999) - Texas Instruments (TI) (NYSE:TXN)
today announced and demonstrated -- at the cable industry's Western Show
in Los Angeles -- the industry's first successful implementation of the
Session Initiation Protocol (SIP) technology in a voice-enabled cable
modem reference design.  SIP is an Internet Engineering Task Force
(IETF) standards-track signaling protocol for Internet telephony and
conferencing.  Voice-enabled cable modems utilizing SIP can be used to
set up phone calls and for features such as call conferencing, call
transfer and call forwarding via the Internet.  This capability will
bring greater flexibility to system operators, eliminating the need to
reconfigure cable modem boxes to meet the protocol requirements of
specific networks.

Powered by its embedded communications software and programmable digital
signal processing (DSP) technology, TI's LBT400DV cable modem reference
design is now capable of using either SIP-based distributed control
signaling (DCS) or media gateway control protocol (MGCP) in network
control signaling (NCS).  This ability to switch protocols from MGCP/NCS
to SIP/DCS in the same cable modem reference design is unique in the
industry.  TI's new SIP-enabled cable modem reference design will enable
its customers -- cable modem manufacturers -- to build cable modems that
are capable of switching between the two protocols. 

"SIP allows cable-telephony operators to bring advanced telephone
services to cable-telephony subscribers that go beyond replacing the
existing telephone infrastructure," Professor Henning Schulzrinne of
Columbia University, co-author of the SIP specification.  "A
standards-based approach allows universal, end-to-end connectivity all
across the Internet.  Implementations such as Telogy's help to
accelerate the move towards interoperability." More information about
SIP is available at http://www.cs.columbia.edu/sip. 

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The worldwide leader and pioneer in digital signal processing solutions
since 1982, Texas Instruments provides innovative DSP and mixed
signal/analog technologies to more than 30,000 customers in the
computer, wireless communications, networking, Internet, consumer,
digital motor control and mass storage markets worldwide.  To help
customers get to market faster, TI offers easy-to-use development tools
and extensive software and hardware support, further complemented by
close to 300 third-party DSP solutions providers.

Texas Instruments Incorporated is a global semiconductor company and the
world's leading designer and supplier of digital signal processing and
analog technologies, the engines driving the digitalization of
electronics.  Headquartered in Dallas, Texas, the company's business
also include materials and controls, educational and productivity
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