Enabling Wireless Infrastructure Solutions

May 9, 2013 Brian Bronson, President & CEO

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Safe Harbor & Non-GAAP Measures

Safe Harbor Statement This presentation contains forward-looking statements, including the Company’s outlook. Radisys undertakes no obligation to update any such statement to reflect later developments. Information on factors that could cause actual results to vary materially from those in this presentation is available in our most recent Annual Report on Form 10-K as filed with the SEC.

Non-GAAP Measures This presentation contains non-GAAP measures that are labeled as “non-GAAP”. A reconciliation of those measures to the most comparable GAAP measures is available in the Company’s prior earnings releases on Form 8-K as filed with the SEC.

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Radisys Company Snapshot

Provide mission critical technology to enable wireless telecom networks (LTE / 3G)

• Media Resource Function (MRF), Radio Access (Small Cells), ATCA Systems and Solutions

Category leader in telecommunications software and hardware, with history of innovation

Strong player in the growing LTE wireless infrastructure market

Positioned well to capture share in VoLTE, video calling/conferencing, small cell, NFV and SDN growth markets

Industry Leader In ATCA, MRF And

Small Cell

Large Market Opportunity With

Exposure To VoLTE / Small Cell

/ Video Trends

Differentiated Technology / Solutions In

Software And Platforms

Highly Diversified, Global Blue-Chip Customer Base

Visionary And Experienced Management

Team

2012 Revenue $286.5M

ATCA Platforms

$137

COMe/RMS $50

Other $47

Software-Solutions $52

Market Leader Enabling Wireless Infrastructure Solutions for Telecommunications, Aerospace & Defense Applications

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Our Focus… Data Remains the Growth Engine

Source: Heavy Reading

0

6

12

2011 2012 2013 2014 2015 2016*An exabyte equals one billion gigabytes. Source: Cisco VNI Mobile, 2012

Global Data Usage

Technology to solve the growing wireless network capacity challenges

Exab

ytes

* per

Mon

th Video doubles traffic

every 12 months

Revenue v. Traffic Growth

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Our Product Portfolio Enabling Wireless Infrastructure Solutions

ATCA / R220 Software - Solutions COMe/RMS Other Products

Focused Investment for Growth

% Revenue 50% 20% 20% 10%

Long Term Growth 10% - 15% 20%+ 0% -50%

Gross Margin* 35% - 40% 65% - 75% 20% - 25% 10% - 15%

Professional Services

Advanced Telecommunications

Computing Architecture

Protocol Software

Media Resource Function (MRF)

Com Express

Rack Mount Server

Custom Boards for 2.5G – 3G Wireless

Infrastructure

* Gross Margin on Non-GAAP basis.

R220 Network Appliance

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Software and Solutions MRF Product Family

Turn-key system provides Real-Time Protocol (RTP) media processing required for network audio conferencing

Predominantly focused on mature and stable audio conferencing market

23% 2012 year on year revenue growth

MPX-12000

Software MRF

CMS-3000

Opens up new high growth market opportunities

• Voice over LTE (VoLTE) • Rich Communication Services (RCS) • Video Gateway, Calling, Conferencing

2013 trials turning into 2014+ deployments

• 10+ trials ongoing with meaningful carriers

CMS-9000

Increasing Capabilities and Capacity

Audio Conferencing (~30% market share) Audio Conferencing + VoLTE + RCS + Video

7 10+ Silicon Ecosystem Partners

Coverage

Cap

acity

Macro

Micro /Pico

Greater Femto

Femto

Our Trillium Focus: LTE Small Cells

Software and Solutions Trillium

Small Cell turn-key application software

• 3G: Femtotality • LTE: TOTALeNodeB • Key deployments in Korea/Japan 2H 2013 • Other deployments building in 2014+

World’s leading protocol software for processing of wireless & wireline signaling

All top 10 telecom equipment manufacturers use Trillium

LTE Small Cells enable Wireless Spectrum Optimization

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Broadest portfolio of ATCA products • #1 supplier of telecom compute platforms • Unsurpassed breadth of silicon & partner

technologies • Full platform integration

Software & Professional Services • Software / hardware specialized solutions

(e.g., Deep Packet Inspection, Security, Evolved Packet Core)

T-Series ATCA / R220 Platforms Building the Foundation for Telecom Networks

Deep Packet Inspection

Wireless/Wireline Voice, Data &

Video Gateways

Defense & Aerospace

Communications

Network Monitoring

Markets & Applications Telecommunications

Defense & Aerospace

Public Safety (Police, Fire, Security)

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Solutions Overview Leveraging our Telecom Expertise

Blend Hardware, Software, Professional Services and Wireless Expertise • Drive differentiation • Create stickiness • Capture larger share of customer spend

Customer Value Proposition • Deliver tomorrow’s products today • Save a bundle with our bundle

Selling Solutions • Built on our products • Integrated, customized, delivered via Professional Services

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Solutions Key Focus Areas

Significant Customer Traction in this New Strategic Focus Area

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End-to-End LTE Infrastructure

Small Cell TotaleNodeB

ATCA T-Series EPC Stacks

R220 ATCA T-Series

MPX-12000 MRF/SIPWare

Solutions

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Diversified Markets, Key Customers

Telecommunications Media Resource Function Aero & Defense

Custom Solutions Medical & Embedded

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Strong Global Footprint

Vancouver

Hillsboro - HQ Boston

Gdansk

Japan

Penang

Shanghai

Shenzhen

Research & Development Centers

Sales / Support Offices

Manufacturing Site ~1,000 Current Headcount

San Diego

Bangalore

Americas 25%

EMEA 2%

Asia Pacific 73%

Software, Pro Svcs & Architects

440 Hardware

160

Software Contractors

110

Engineering Headcount

Barcelona Seoul

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Financial Model

All amounts presented on a Non-GAAP basis. A reconciliation of GAAP to Non-GAAP results is available in the April 25, 2013 earnings release located on the Radisys IR website and on Form 8-K. 2013 represents consensus street estimates

$ millions (except EPS)

Gross Margin 2011 2012

2013 Street Est

Long Term Model

$0.29$0.15

5 - 10% Growth10 - 15% Growth

Stable

(50%)

0 - (5%) Decline

35%

EPS

Operating Income %

Gross Margin %

Total Revenue 15 - 20% Growth

$332.9 $286.4

$0.55

33% 34% ~40%

5% 2% 10 - 12%3%

Stable

Other Legacy ~15% 104.5 47.3 0

39.0 53.0

COMe/RMS 20 - 25% 56.8 49.5

10 - 15% Growth

20%+ Growth

ATCA 35 - 40% 132.5 136.6

Software-Solutions 65 - 70%

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Q1 Financial Results/Q2 Guidance

Q1 financial results met expectations • Generated $0.5m in cash excluding

changes in debt levels

• $5m inventory reduction to $24m

Growing Software-Solutions revenue enable Q2 expected margin expansion • 10+ trials for MRF VoLTE / RCS

applications (2013 trial units, 2014 deployments)

Continued focus on operational improvements / efficiencies

All amounts presented on a Non-GAAP basis. A reconciliation of GAAP to Non-GAAP results is available in the April 25, 2013 earnings release located on the Radisys IR website and on Form 8-K.

Q1 2013Q2

Guidance

ATCA 34.8 FlatSoftware-Solutions 11.6 +COMe/RMS 14.6 -Other 7.1 -

Total Revenue 68.2 $63 - $69

Gross Profit 22.0Gross Margin 32% 34% to 36%

Operating Expense 21.7 Flat

Operating Income 0.3% Sales 1%

Non-GAAP EPS 0¢ (3¢) - 9¢

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Liquidity As of March 31, 2013

Q1 2013 Cash Balance $32m

Debt Silicon Valley Bank Line ($15m)

• $40m line expires Sept 2014 • $29m availability as of March 31, $14m unused

Convertible Note ($18m) • Due Feb 2015, 4.5% Coupon, $8.53 convert price

(10)

(5)

0

5

10

15

20 Free Cash Flow

Restructuring Cash Use

• Note: Assumes April 26, 2013 street consensus financial performance before restructuring.

2010 2011 2012

$M

2013

$10m - $15m*

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Summary

Leadership in growing markets driven by exponential growth in Voice, Data and Video Usage • Voice over LTE • LTE network deployments • 3G/LTE network optimization

Focus on leveraging telecom expertise to enable customer’s wireless network infrastructure • MRF • Unique Software-Hardware

solutions • Full system ATCA • Small Cells