Exhibit 99.1

                 Tekelec Announces Partial Q4 Results; Achieves
             Orders of $159.7 Million and Revenue of $115.9 Million

    CALABASAS, Calif.--(BUSINESS WIRE)--Feb. 9, 2005--Tekelec
(Nasdaq:TKLC) today reported partial financial results for its fourth
quarter ended December 31, 2004.
    As the result of a routine, periodic review by the Securities and
Exchange Commission ("SEC") of Tekelec's Annual Report on Form 10-K
for the year ended December 31, 2003, the Company is currently engaged
in discussions with the SEC regarding the accounting for the
acquisition of the Company's majority interest in its Santera
subsidiary and the allocation of Santera's profits and losses between
Tekelec and Santera's minority shareholders following the acquisition.
This is the only matter under discussion with the SEC. Pending
resolution of this matter, Tekelec has decided at this time not to
release full financial results for the fourth quarter and full year
2004. Once the discussions with the SEC are concluded, Tekelec will
release its financial results for these periods. The Santera purchase
accounting matter currently being discussed with the SEC has no impact
on previously reported or future orders, revenues, cash flows, or cash
balances.
    Revenue for the fourth quarter of 2004 was $115.9 million,
compared to $75.0 million in the fourth quarter of 2003. Orders
received in the fourth quarter for Tekelec products and services were
$159.7 million, compared to $138.1 million in the fourth quarter in
2003.
    Revenue for the full year 2004 was $397.1 million compared to
$263.7 million in 2003.
    Tekelec President and CEO Fred Lax commented, "Tekelec's order and
revenue performance in the fourth quarter was again strong. This
reflects the progress we are making on our strategic objectives of
delivering world-class next-gen switching solutions, extending our
signaling solutions leadership and expanding our value-added
applications offerings, all in parallel, as we prudently pursue global
expansion. The $115.9 million of revenue this quarter is the highest
in the history of the Company, increasing 9% sequentially and 54%
year-over-year. The $159.7 million of orders generated during the
quarter, a 16% increase year-over-year, is also the highest total in
the history of the Company, surpassing the previous order record of
$151 million achieved in Q3 '04. The book-to-bill ratio of
approximately 1.4 indicates the continuing strength of Tekelec's
business, with all Groups achieving a book-to-bill above 1. This is
the ninth consecutive quarter in which Tekelec's book-to-bill ratio is
above 1. For the full year, the order total of $520.1 million and
revenues of $397.1 million represent a 54% order increase and 51%
revenue increase over the 2003 totals, producing a 1.3 book-to-bill
for the full year. These full-year order, revenue, and book-to-bill
ratios are all records for the Company and demonstrate that Tekelec
continues to execute on its strategic objectives, while positioning
itself for future growth opportunities.
    "Regarding our next-gen switching strategic initiative, revenues
increased 35% sequentially to $20.4 million, and we added 19 new
next-gen customers, bringing Tekelec's next-gen switching customer
total to over 200, including the 45 customers VocalData had prior to
its acquisition by Tekelec. During the quarter we were pleased to
announce that a Tier 1 operator in Asia will be deploying Tekelec's
T8000 Wireless Media Gateway to support the rollout of Gateway MSC and
Distributed MSC applications, which will help to significantly reduce
operating and capital costs for the carrier. This deployment
represents the fourth Tier 1 operator, including three Tier 1 wireless
operators, to deploy Tekelec's next-gen switching equipment, and
further establishes Tekelec as a leader in the wireless next-gen
switching space.
    "With regard to signaling solutions, revenue for our Network
Signaling Group was $78.9 million, up 40% year-over-year, and the
highest signaling revenue in the history of the Company, driven by
robust sales in the U.S. and continued success in our global expansion
efforts, with six of the seven new NSG customers in the quarter
located outside of the United States. For the full year 2004,
signaling revenue increased by 39% compared to 2003.
    "In the area of value-added applications, on October 14th we
completed the acquisition of Steleus, a global supplier of real-time
performance management and business intelligence communications
software solutions for both fixed and mobile telecom networks. Steleus
forms the cornerstone of Tekelec's new Communications Software
Solutions Group. We are pleased to announce today that a European
mobile operator has selected Tekelec's integrated signaling network
monitoring system for acquiring and managing network, service and
subscriber data. The system will be used by the operator to capture
and store service and subscriber information, which feeds business
intelligence applications, such as customer care, fraud control, and
quality of service. This improved level of visibility allows the
operator to monitor its network in real time, alleviating operational
concerns and customer issues surrounding the rollout of new
technologies.
    "Finally, regarding global expansion, approximately 31% of sales
during the quarter were from outside the U.S., highlighting the
progress we are making on our global expansion efforts. As one example
of this success, we are pleased to announce that VSNL, an India-based
long-distance and international long-distance carrier, will deploy
Tekelec's Eagle 5 SAS platform. VSNL represents the fourth Indian
operator to select Tekelec as its signaling vendor, joining previously
announced Tekelec customers Tata, Reliance, and Bharti, as Tekelec
continues to be the provider of all built-for-purpose signaling
platforms currently deployed in India, one of the fastest growing
telecommunications markets in the world."



Group Revenue Results

The year-over-year Group revenue results are as follows:

                                                     Revenue

       Group                                Q4 2004           Q4 2003
                                     ($ in Millions)   ($ in Millions)

Switching Solutions                          $20.4              $5.7
Network Signaling                            $78.9             $55.8
Communications Software (1)                   $5.1              $4.2
IEX Contact Center                           $11.5              $9.3


(1) As a result of the Steleus acquisition, a new operating Group,
Communications Software Solutions, was created in Q4 2004. This Group
consists of the Steleus solutions and Tekelec's existing business
intelligence applications and other network element independent
solutions that were previously reported as part of the Network
Signaling Group. The revenue related to these products was
reclassified from the Network Signaling Group to the Communications
Software Solutions Group for 2003 and 2004.



    Lax concluded, "In 2004, Tekelec made significant progress on
extending our signaling solutions, expanding our portfolio of
value-added applications, developing our next generation switching
solutions, and prudently pursuing global expansion. As we look to
2005, we are confident that our approach of investing consistent with
these strategic objectives has positioned us to take advantage of
future growth opportunities. In respect of our ongoing SEC
discussions, we are committed to completing our discussions as quickly
as possible and bringing this matter to conclusion."

    Employment Inducement Stock Options

    On February 8, 2005, 28 new Tekelec employees hired during the
fourth quarter of 2004 were granted options to purchase a total of
216,950 shares of Tekelec common stock. The number of shares subject
to such options amounts to less than 1% of the outstanding shares of
Tekelec common stock. The option grants were made under Tekelec's 2004
Equity Incentive Plan for New Employees and met the "employee
inducement" exception to the Nasdaq rules requiring shareholder
approval of equity-based incentive plans.

    About Tekelec

    Tekelec is a leading developer of now and next-generation
switching and signaling telecommunications solutions, network
performance management technology, and value-added applications.
Tekelec's innovative solutions are widely deployed in traditional and
next-generation wireline and wireless networks and contact centers
worldwide. Corporate headquarters are located in Calabasas, CA. with
research and development facilities and sales offices throughout the
world. For more information, please visit www.tekelec.com.

    Forward-Looking Statements

    Certain statements made in this news release are forward looking,
reflect the Company's current intent, belief or expectations and
involve certain risks and uncertainties. There can be no assurance
that the Company's actual future performance will meet the Company's
expectations. As discussed in the Company's 2003 Annual Report on Form
10-K and other filings with the SEC, the Company's future operating
results are difficult to predict and subject to significant
fluctuations. Factors that may cause future results to differ
materially from the Company's current expectations include, among
others: overall telecommunications spending, changes in general
economic conditions, the timing of significant orders and shipments,
the lengthy sales cycle for the Company's products, the timing of the
convergence of voice and data networks, the success or failure of
strategic alliances or acquisitions including the success or failure
of the integration of Santera,Taqua, Steleus, and VocalData's
operations with those of the Company, the ability of carriers to
utilize excess capacity of signaling infrastructure and related
products in their networks, the capital spending patterns of
customers, the dependence on wireless customers for a significant
percentage and growth of the Company's revenues, the timely
development and introduction of new products and services, product
mix, the geographic mix of the Company's revenues and the associated
impact on gross margins, market acceptance of new products and
technologies, carrier deployment of intelligent network services, the
ability of our customers to obtain financing, the timing of revenue
recognition of multiple elements in an arrangement sold as part of a
bundled solution, the level and timing of research and development
expenditures, regulatory changes, and the expansion of the Company's
marketing and support organizations, both domestically and
internationally. The Company undertakes no obligation to publicly
update any forward-looking statements whether as a result of new
information, future events or otherwise.



    CONTACT: Tekelec
             Michael Attar, (818) 880-7821