Allot MobileTrends Report Shows Significant 73% Growth in Global Mobile Data Bandwidth Usage in H2, 2010

Twitter Bandwidth Leaps by 378%; Apple Captures 89% of App Store Traffic; VoIP & IM Applications Grow by 87%

BOSTON, February 8, 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 that
its Allot MobileTrends Report (
www.allot.com/MobileTrends_Report_H2_2010.html) shows that mobile data
bandwidth usage continued its phenomenal rise with 73% growth during the
second half (H2) of 2010. Video streaming continues to drive this growth as
it remains the fastest growing application type, accounting for 37% of mobile
bandwidth. Allot will be exhibiting at Mobile World Congress from 14-17
February, in hall 2, booth B53.

(Photo: www.newscom.com/cgi-bin/prnh/20110208/435083 )

The H2 2010 MobileTrends Report reveals that YouTube is responsible for a
tremendous 17% of mobile data bandwidth usage and continues as the single
most significant website for video streaming, accounting for 45% of total
video streaming traffic. The report also shows the continued exponential
growth experienced by social networking applications such as Twitter and
Facebook, which grew by 378% and 267%, respectively, underlining the natural
synergy that exists between social media and the mobile Internet. The use of
VoIP and IM applications also continued to grow rapidly with an 87% increase,
demonstrating their ongoing appeal for subscribers.

This Allot MobileTrends Report also reveals that Google's Android Market
lags far behind Apple's App Store with only 9% of the overall app store
download traffic. However, its rapid 177% growth rate may influence this
balance in the near future.

"Our MobileTrends findings demonstrate that mobile operators must
understand the value that over-the-top applications provide to users rather
than just focus on the amount of bandwidth they consume," said Rami Hadar,
President and CEO of Allot Communications. "As networks move towards
4G/LTE(TM) and convergence, understanding this value is likely to become even
more critical as operators will be expected to provide a more enriched and
personalized experience for their users."

Findings from the Allot MobileTrends Report also include:

    - YouTube remains one of the single most popular mobile
      Internet destinations, accounting for 17% of mobile data bandwidth.

    - P2P and HTTP downloads together represent a significant 30%
      of mobile bandwidth.

    - Apple's App Store is responsible for 89% and Google's
      Android Market is responsible for 9% of overall app store download
      traffic.

    - Skype continues as the undisputed VoIP market leader,
      accounting for 87% of mobile VoIP bandwidth.

The Allot MobileTrends Report data was collected from July 1 to December
31, 2010 from leading mobile operators worldwide with a combined user base of
210 million subscribers. Allot gathered the data using the long term
reporting capabilities of Allot NetXplorer (
www.allot.com/NetXplorer.html), Allot's centralized management and
reporting system. The length of the collection period allows accurate
identification of usage trends and patterns, reducing the influence of
temporary events in the monitored networks.

The full Allot MobileTrends Report (complete with graphics) can be found
on www.allot.com/MobileTrends_Report_H2_2010.html

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.

Trademark Notice

The term LTE(TM) is 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 estimate
that the balance of the overall app store download traffic will change. 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
    Director of Marketing
    Allot Communications
    Tel: +972-9-7628423
    jgordon@allot.com

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

Allot Communications Contacts: Jonathon Gordon, Director of Marketing, Allot Communications, Tel: +972-9-7628423, jgordon at allot.com. PR Contact, Danielle Matthews, Calysto Communications, Tel: +1-404-266-2060 x27, dmatthews at calysto.com