Sonus - Overview Andrew Mok – Senior Sales Engineer for HK and Taiwan

Who is Global Leader in SIP Communications Fastest Growing SBC Portfolio on the Market VoIP Foundation of the World’s Largest Networks Founded in 1998, a 15 years old company 2 Confidential and Proprietary

Sonus Snapshot Market Leadership Product Leadership Innovation Strong Financial Position Leader in Gartner Magic Quadrant for SBCs 4 of 5 World’s Largest Service Providers Rely on Sonus Broadest Portfolio of Microsoft Lync Qualified SBCs Fastest Growing SBC Vendor in the Service Provider Market ~1,100 Employees 71% Engineering Cumulative R&D Spend Over $650M from Inception No Debt Strong Balance Sheet 2012 Revenues $254M 3

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Confidential and Proprietary Headquarters Westford, MA, USA Research & Development Centers Freehold, NJ Schaumberg, IL Swindon, UK Bangalore, India Customer Service/ Network Ops Center Richardson, TX Bangalore, India Prague, Czech Republic Tokyo, Japan Local Offices Paris, France Darmstadt, Germany Dubai, UAE Sydney, Australia Beijing, China Shanghai, China Hong Kong, China Taipei, Taiwan Delhi, India Tokyo, Japan Kuala Lumpur, Malaysia Regional Offices EMEA - Staines, UK APAC - Singapore Local Presence Italy Spain Switzerland Saudi Arabia UK – EMEA Westford, MA Freehold, NJ Richardson, TX Singapore - APAC Confidential and Proprietary

Confidential and Proprietary Sonus Partnerships Confidential and Proprietary

Sonus Global Service Provider Customer Base 120+ Service Provider and Enterprise networks deployed in over 50 countries Americas EMEA APAC Strategic Relationships: Over 30 customers have invested $10M+ with Sonus Confidential and Proprietary

Sonus Global UC End Customers

Global Enterprise SBC Market 2012 Enterprise SBC Revenue Share Infonetics Enterprise Session border Controllers, March 2013 Sonus Proprietary and Confidential – use pursuant to NDA

Global Enterprise SBC Market 1Q’13 Enterprise SBC Revenue Share Infonetics Enterprise Session border Controllers, June 2013 Sonus Proprietary and Confidential – use pursuant to NDA

Sonus Proprietary and Confidential – use pursuant to NDA Execution Focus Drives Share Gains SBC Worldwide Quarterly Market Share Industry leading share gain 20.1% market share in 1Q’13 Sonus Infonetics Enterprise Session border Controllers, June 2013 Sonus Proprietary and Confidential – use pursuant to NDA

Unifying Unified Communications The Sonus Mission Unifying Unified Communications Using the Cloud So Businesses Become More Productive by Working Smarter, Faster & More Collaboratively Confidential and Proprietary

Roadmap Alignment with Growth Markets UC: $800M market in 2017* Lync: Market leader in Q1, 2013* Multi-Vendor Env 61% of Enterprises are multi-vendor** SIP Trunking $7.5B in 2017; 2012–2017 5-year CAGR of 40% * Hosted Solutions: 31% of Business VoIP in 2012* $10.8B in 2017* WebRTC expected to be a significant new driver in this market segment Enterprise Video: 6% CAGR thru 2017 Video key driver for increased UC traffic SDN & NFV: Exponential Growth - $1.2 billion by 2018, up from $10 million in 2012 (SDN Market Sizing Report" by SDNCentral and Lightspeed Venture Partners, April 2013 ) LTE: GSA forecasts 260 commercial LTE networks in 93 countries by end 2013 4G/LTE SIP CLOUD VIDEO VIRTUALIZATION Through various mergers and acquisitions, many enterprises have numerous PBX vendors and models resulting in many routing touch points. Many enterprises are challenged to migrate their networks from TDM to IP or H.323 to SIP. Sonus products are ideal to assist with this migration as we handle circuit and packet along with interworking between SIP and H.323. UC: UC market continues to expand; forecast to be $800M in 2017 (Infonetics) Lync: Video Conferencing & Telepresence 10% sequential revenue growth in Q4, 2012 to $822M Lync Momentum continues; 34% of licenses in Q1, 2013 (Infonetics) Multi-Vendor Env 61% of Enterprises are multi-vendor (Nemertes Research 2013) SIP Trunking $7.5B in 2017; 2012–2017 5-year CAGR of 40% (Infonetics) 50% Enterprises rolling out Hybrid Clouds (IDC Jan 2013 Survey) Service Provider Mobile Operator Cable/MSO Enterprise Government *Infonetics **Nemertes 13

Roadmap Alignment with Growth Markets Lync Interop Enhancements (SBC 1000/2000 & SBC 5000 Series) SIP CONNECT 1.1 support (SBC 5000 Series) MS Lync Presence support (SBC 5000 Series) Lync QoE Server support (SBC 1000/2000) Application level security (SBC 1000/2000) Video bypass (SBC 1000/2000) BroadSoft Interperability (SBC 1000/2000) Additional features in the planning stage SIP UC and Lync Multi-Vendor Environment SIP Trunking Some features are in the planning phase, and not fully committed 2H 2013 1H 2014 2H 2014 and Beyond

Roadmap Alignment with Growth Markets Lync Interop Enhancements (SBC 1000/2000 & SBC 5000 Series) SIP CONNECT 1.1 support (SBC 5000 Series) Video support (SBC 5000 Series) Software SBC (SBC SWe) VmWare support (SBC Swe) Software based transcoding (SBC SWe) Policy Engine Virtualization (PSX) WebRTC Support CLOUD Hosted UC & VoIP Hybrid Clouds WebRTC Some features are in the planning phase, and not fully committed 2H 2013 1H 2014 2H 2014 and Beyond

Roadmap Alignment with Growth Markets SIP-SIP and H323-H323 Video Support (SBC 5000 Series) SIP Based Content Share (BFCP) and FECC for conferencing (SBC 5000 Series) Enable SBC-5x00 to provide traditional SBC functionality to video (SBC 5000 Series): CAC, BW controls, codec routing, DOS, sRTP/sRTCP, route PSP policy, etc Policy Video support for SBC (PSX) Video pass through (SBC 1000 Series) Additional Video enhancements (PSX) Full H.323 video – peer-2-peer, conferencing, collaborative data sharing SIP/H.323 interworking WebRTC Support VIDEO Enterprise Video Service Provider Video Some features are in the planning phase, and not fully committed 2H 2013 1H 2014 2H 2014 and Beyond

Roadmap Alignment with Growth Markets Software SBC (SBC SWe) VmWare Support (SBC SWe) Software based transcoding (SBC SWe) Juniper SRC Support Policy Engine Virtualization (PSX) Systems Management Virtualization (EMS & DSI) Elasticity, Capacity Features VIRTUALIZATION SBC Policy Some features are in the planning phase, and not fully committed 2H 2013 1H 2014 2H 2014 and Beyond

Roadmap Alignment with Growth Markets IMS support (SBC 5000 Series) Diameter/SBC support (SBC 5000 Series) Software SBC (SBC SWe) Additional IMS support (SBC 5000 Series) Additional Diameter/SBC support (SBC 5000 Series) 10G SBC Additional IMS support (SBC 5000 Series) Diameter/SBC enhancements (SBC 5000 Series) MSRP 4G/LTE Diameter VoLTE Interconnect IMS Some features are in the planning phase, and not fully committed 2H 2013 1H 2014 2H 2014 and Beyond

Roadmap Highlights 10Gb SBC SBC SWe 4.1 SBC 5K 4.1 SBC 1K/2K 3.1 Q2 2014. 2014 SBC SWe 4.1 Q2/Q3 2014. SBC 5K 4.1 Q2 2014. 2013 SBC 1K/2K 3.1 Q1 2014. PSX/GSX/EMS 9.2 Q2 2014. PSX/GSX/EMS 9.1 Q4 2013. SBC 5K 4.0 Q4 2013. SBC SWe 3.x Q4 2013. Release not fully committed

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