Allot Receives a $4.5M Order From Tier-1 Fixed Operator

This Phase of SG Sigma Platforms Manages Over 1000 Gbps of Bandwidth

BOSTON, Massachusetts, June 2, 2010 - Allot Communications Ltd. (NASDAQ: ALLT), (www.allot.com/) a
leading supplier of service optimization and revenue generation solutions for
fixed and mobile broadband service providers worldwide, today announced a
deal with a Tier-1 fixed operator for $4.5 million. The operator has bought
Allot solutions based on the Company's flagship product, the Allot Service
Gateway Sigma (SG-Sigma) (www.allot.com/Service_Gateway_Sigma.html).
The SG-Sigma maximizes network efficiency and performance and improves the
user experience by integrating network intelligence, policy control, and
revenue-generating services in a single platform.

This multi-site deployment is intended to initially handle more than 1
terabit of traffic. The SG-Sigma's superior bandwidth management capabilities
will enable the operator to extract more comprehensive intelligent
information from the network and use this information to optimize network
performance. This will result in better management of existing network
resources, thereby offering the subscribers an improved and more personalized
experience.

"This win is further proof of SG-Sigma's superior capabilities and its
standing as the operator platform of choice, both for fixed and for mobile
broadband networks," said Rami Hadar, Allot's President & CEO. "Our proven
execution on large deployments makes Allot a preferred vendor for Tier 1
operators."

About Allot Service Gateway Sigma

Allot Service Gateway Sigma (SG-Sigma) is the only intelligent Service
Gateway platform designed to meet current and future service provider
requirements. It facilitates the fast and easy introduction of new
value-added network and subscriber services, (
www.allot.com/Service_Protector.html) including TierManager, Quota
Manager, NetPolicy Provisioner, CellWise, MediaSwift, WebSafe and
ServiceProtector - services designed to reduce network TCO, increase ARPU and
enhance the user experience.

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
(DART) (www.allot.com/Dynamic_Actionable_Recognition_Technology.html)
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.

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. These forward-looking statements are based upon
management's current estimates and projections of future results or trends.
Actual results may differ materially from those projected as a result of
certain risks and uncertainties. These factors include, but are not limited
to: the expected characteristics of the deployed solution with the Tier-1
Fixed Operator, 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 Contact
    Jonathon Gordon
    Director of Marketing
    Tel: +972-9-7619423
    jgordon@allot.com

    Jay Kalish
    Executive Director, Investor Relations
    Tel: +972-54-2211365
    jkalish@allot.com

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

Allot Communications Contact: Jonathon Gordon, Director of Marketing, Tel: +972-9-7619423, jgordon at allot.com; Jay Kalish, Executive Director, Investor Relations, Tel: +972-54-2211365, jkalish at allot.com; PR Contact, Danielle Matthews, Calysto Communications, Tel: +1-404-266-2060 x27, dmatthews at calysto.com