Allot Launches Service Gateway Sigma E for LTE(TM) Networks, Propelling the Industry to 160 Gbps Throughput

SG-Sigma E offers a Growing Portfolio of Intelligent Services Integrated Within the Policy Control & Charging Framework

BOSTON, January 25, 2011 - Allot Communications Ltd. (www.allot.com/ )(NASDAQ: ALLT), a
leading supplier of service optimization and revenue generation solutions for
fixed and mobile broadband service providers worldwide, announced today the
launch of Allot Service Gateway Sigma E (
www.allot.com/Service_Gateway_Sigma_E.html ) (SG-Sigma E). Boasting
160 Gbps of throughput and supporting 8 million subscribers on a single
platform, SG-Sigma E is designed to meet the high-speed and extreme
performance requirements of 4G/LTE and fixed-mobile converged networks,
enabling operators to enhance the user experience whilst generating revenue
from over-the-top (OTT) applications. SG-Sigma E will be on display for the
first time during Mobile World Congress from 14-17 February, hall 2, booth
B53.

(Photo: www.newscom.com/cgi-bin/prnh/20110125/431818 )

Allot SG-Sigma E is the only service gateway platform of its kind to
deliver extreme performance of up to 1 Terabit per second in a clustered
configuration. Acting as a nerve center in the network, the platform enables
operators to expand their role in the Internet value chain by providing vital
information on applications, subscribers and network topology. This knowledge
is crucial to implementing Intelligent Charging models which enable the
monetization of OTT applications such as video, social networking and more.
SG-Sigma E is also designed to reduce deployment complexity, time-to-market
and TCO for the operator, by enabling in-platform deployment of Allot or
third party network and subscriber services (
www.allot.com/Service_Protector.html) such as video optimization,
advanced media caching and DoS/DDoS protection.

"With the huge amount of traffic expected on LTE networks, operators must
put in place solutions that will enable them to manage the oncoming torrent
of data," said Shira Levine, directing analyst for next gen OSS and policy at
Infonetics Research. "For the mobile Internet market to continue its
exponential growth, those solutions need to be specifically designed to
provide the performance and intelligence required to maximize network
efficiency, enable smart charging and deliver next-generation services that
will open up new revenue streams to operators."

"LTE signifies the next big step forward for mobile Internet. It
represents a huge opportunity for operators to improve the way they deliver
Internet to subscribers in terms of throughput, the services that they offer
and how they charge for it," said Rami Hadar, Allot's President and CEO.
"SG-Sigma E is designed to do exactly that."

The highly scalable SG-Sigma E architecture enables pay-as-you-grow
deployment, allowing operators to upgrade capacity and add services at any
time. SG-Sigma E is based on AdvancedTCA(R) standards, 3GPP fully-compliant
and engineered to meet the NEBS design guidelines.

Allot Communications pioneered the concept of a carrier-class platform
for intelligent network management and integrated services in 2007 with the
launch of Service Gateway Omega. SG-Sigma E is the third generation of this
vision.

About Allot Communications

Allot Communications Ltd. (NASDAQ: ALLT) is a leading provider of
intelligent IP service optimization and revenue generation solutions for
fixed and mobile broadband operators and large enterprises. Allot's rich
portfolio of solutions leverages Dynamic Actionable Recognition Technology
(www.allot.com/Dynamic_Actionable_Recognition_Technology.html ) (DART)
to transform pipes into smart networks that can rapidly and efficiently
deploy value added Internet services. Allot's scalable, carrier-grade
solutions provide the visibility, topology awareness, security, application
control and subscriber management that are vital to managing Internet service
delivery, enhancing user experience, containing operating costs, and
maximizing revenue in broadband networks.

Trademark Notice

The terms 3GPP and LTE are registered Trade Marks of ETSI.

Safe Harbor Statement

Information provided in this press release may contain statements
relating to current expectations, estimates, forecasts and projections about
future events that are "forward-looking statements" as defined in the Private
Securities Litigation Reform Act of 1995. These forward-looking statements
generally relate to the company's plans, objectives and expectations for
future operations, including the expectation for huge amount of traffic on
LTE networks, the market demand for the SG-Sigma E and the expected
performance characteristics of the SG-Sigma E and its ability to meet
operators' requirements and expectations. These forward-looking statements
are based upon management's current estimates and projections of future
results or trends. Actual future results may differ materially from those
projected as a result of certain risks and uncertainties. These factors
include, but are not limited to: changes in general economic and business
conditions and, specifically, a decline in demand for the company's products;
the company's inability to develop and introduce new technologies, products
and applications; loss of market; and other factors discussed under the
heading "Risk Factors" in the company's annual report on Form 20-F filed with
the Securities and Exchange Commission. These forward-looking statements are
made only as of the date hereof, and the company undertakes no obligation to
update or revise the forward-looking statements, whether as a result of new
information, future events or otherwise.

    Allot Communications Contacts
    Jonathon Gordon
    Allot Communications
    Tel: +972-9-7619423
    jgordon@allot.com

    PR Contact
    Danielle Matthews
    Calysto Communications
    Tel: +1-404-266-2060 x27
    dmatthews@calysto.com

Allot Communications Contacts, Jonathon Gordon, Allot Communications, Tel: +972-9-7619423, jgordon at allot.com; PR Contact, Danielle Matthews, Calysto Communications, Tel: + 1-404-266-2060 x27, dmatthews at calysto.com