Airband Communications Company Overview Confidential and Proprietary

Company Overview Airband – the nation’s largest fixed wireless provider of business voice/data services Solutions: Internet Access Full Suite of Voice over IP (Vo. IP) Services Private IP VPN Point-to-Point High-Bandwidth Services Technology: Fixed-Wireless Last-mile Access Network Private IP Backbone Ethernet delivery Founded: 2000 Headquarters: Dallas, TX Confidential and Proprietary 2

Market Coverage • Atlanta, GA • Austin, TX • Baltimore, MD • Dallas, TX • Fort Worth, TX • Ft. Lauderdale, FL • Houston, TX • Los Angeles, CA • Miami, FL • Orange County, CA • Philadelphia, PA • Phoenix, AZ • San Antonio, TX • San Diego, CA Confidential and Proprietary 3

The Airband Advantage Business-Class Services Proven - Services delivered on Airband’s private IP backbone and last-mile fixed wireless network - Been in business since 2000 - Symmetrical bandwidth - Manage our wholly-owned network - Service level guarantees - In 14 markets across the US - Largest fixed-wireless provider in the US - 24 x 7 proactive monitoring Exemplary Support - Dedicated staff - Local field technicians - Responsive customer service Affordable Flexible - Integrated access for voice & data - Buy just the bandwidth you need - not restricted to T 1 & DS 3 increments - Ethernet handoff – no capital for equipment - Significant cost savings from traditional wireline offerings Confidential and Proprietary - Vo. IP – add and remove line/trunks easily - Simple & fast upgrades 4

Data Services: 2 Mbps up to Gig. E Speeds Base Station Internet Access Internet Off-Net Customer Building 1 Point to Point Customer Building 2 Base Station #1 Through-Network Private IP VPN Customer Building 1 Confidential and Proprietary Core Network Customer Building 2 5

Service Delivery Comparison Traditional Wired Delivery Challenges Airband Wireless Point-to-Multipoint Delivery Dedicated Wireless. 4. 5 Mbps 3. 0 Mbps 1. 5 Mbps Central Office Customer Building • 30+ Day Provisioning Intervals • Mileage-based Cost Model • Linear Costs Per T 1 Increment • Lower Throughput On Bonded (3 M+) Connections • MLPPP or IMA overhead Confidential and Proprietary Airband Base Station Customer Building • Provisioning In Days • Upgrades In Hours • Symmetrical Bandwidth not Tied to 1. 5 increments • Pricing Not Mileage based • Ethernet Connection • Scalable Bandwidth for Vo. IP And Data Backup Solutions 6

Full Suite of Voice Services Product Airband Advantage Hosted Vo. IP Fully managed service with a complete suite of calling features Vo. IP Lines Save on monthly telecom expenses by replacing expensive business/B 1 lines with Vo. IP service Analog Line Replacement Vo. IP Trunks SIP Trunking Vo. IP Trunks PRI Replacement Confidential and Proprietary SIP trunking service on our private IP network that ensures quality levels Replace existing PRIs with efficient Vo. IP Trunks for ease of management and cost savings 7

Save with Business Connect Packages Vo. IP Advantage III • 20 Vo. IP Lines & 5 Mbps Internet Bundle: - 20 Vo. IP Lines Vo. IP Advantage II - 5 Mbps Wireless Internet • 10 Vo. IP Lines & 3 Mbps Internet Access Bundle: - Full Suite Of Calling Features - 10 Vo. IP Lines - 200 Domestic LD Vo. IP Advantage Internet. Minutes/Line I - 3 • Mbps Wireless Access Upgrade: • 5 Vo. IP Lines. Full 2 Mbps Internet - & Suite. Additional Stations for a total - 4 Of Calling Features Bundle: - 200 Domestic LD Minutes/Line of 24 - 5 Vo. IP Lines • Upgrade: Additional Bandwidth - 2 Mbps Wireless Internet - 6 Additional Stations for a total - Analog-fax Line Access 16 - Toll-Free Service - Full Suite Of Calling Features - Additional Bandwidth - 200 Domestic LD Minutes/Line - Analog-fax Line • Upgrade: - Toll-Free Service - 3 Additional Stations for a total of 8 - Additional Bandwidth - Analog-fax Line - Toll-Free Service Confidential and Proprietary SIP Advantage II • 23 Vo. IP Trunks & 5 Mbps Internet Bundle: 23 Vo. IP Trunks SIP -Advantage I - 5 Mbps Wireless Internet Access • 15 Vo. IP Trunks & 3 Mbps - 200 Domestic LD Minutes/Trunk Internet Bundle: - Overage - 15 Vo. IP Trunks LD @ $0. 039 - Wireless Internet Access - 3 Mbps 1 Enhanced Telephone Number for 911, Caller ID and Name - 200 Domestic LD Minutes/Trunk - Upgrade: - Overage LD @ $0. 039 - Additional Vo. IP Trunks - 1 Enhanced Telephone Number - Additional and Name for 911, Caller ID Bandwidth • Upgrade: Enhanced Telephone Numbers - DIDs - Additional Vo. IP Trunks - Analog/Fax Line - Additional Bandwidth - Toll-Free Service - Enhanced Telephone Numbers - DIDs - Analog/Fax Line - Toll-Free Service 8

In Building Set Up Customer Building Radio - Size Of A Laptop Computer Confidential and Proprietary 9

In-Market Base Stations: • Full Network Redundancy Via Wireless Ring Topology • Redundant Core Links Between Base Stations • Back-up Power • BGP Peering Via Multiple Redundant Connections Internet (BGP 4) Confidential and Proprietary Internet (BGP 4) 10

Airband MPLS National Backbone Confidential and Proprietary 11

Unified Service Level Agreements • Uptime - Airband Guarantees 100% on-net availability • Jitter - Airband is the only fixed wireless provider in the United States to guarantee jitter of under 10 ms (Important for Vo. IP or Video transmission) • Latency - Airband guarantees 65 ms or less round trip transmission • Packet Loss – Monthly packet loss of less than 1% • Installation Intervals - Airband guarantees installations within 30 business days Confidential and Proprietary 12

Enterprise-Class Support • One Point of Contact − Dedicated coordinator manages all aspects of installation − One number for technical support, billing and service changes • 24/7 Monitoring and Support − State-of-the-art Network Operations Center (NOC) in Richardson, TX Confidential and Proprietary 13

The Airband Advantage Business-Class Services Proven Provider Exemplary Support by Dedicated Local Staff Affordable Confidential and Proprietary Flexible 14

Back-up Information: Network Confidential and Proprietary 15

Fixed Wireless vs Wi. Fi Airband Fixed Wireless Wi. Fi Range Long range - covering up to 30 Miles Short range - covering several hundred yards Scalability Up to Gigabit speeds 802. 11 supports up to 54 megabits Spectrum Licensed & licensed exempt Licensed exempt only Typical Application • WAN connectivity - provide wireless connectivity from the user’s location to the network provider • Can handle voice & data services such as Vo. IP, IP connectivity, VPN • Provide wireless access to the network for homes, coffee shops, hot-spots Quality of Service QOS designed with Airband Network Best effort Security Multi-level encryption Limited Confidential and Proprietary 16

Radio Frequencies Utilized • License-Exempt Spectrum: − 5. 3, 5. 4 DFS and 5. 8 Ghz (Alvarion, and earlier, Trango) − 60 Ghz (Bridgewave) • Licensed Spectrum: − 6, 11, 18, 23, 38, 70 and 80 Ghz (Dragonwave, Ceragon, Cielo, Bridgewave) − 24 Ghz (Dragonwave) License included • LMDS (Local Multipoint Distribution Service): − Atlanta market only, 31 Ghz Confidential and Proprietary 17

Security Airband leverages state-of-the-art technology to prevent security threats • Authentication - Closed access configuration allows only units with correct ESSID to communicate. Only Airband knows the authentication schemes used. • Encryption - Fully encrypted transmission. Airband wireless hardware utilizes Advanced Encryption Standard (AES) 128 bit. Airband point-to-point radios utilize proprietary encryption methods specific to radio manufacturer • Core Network Stability - IP and MAC address filtering utilized to minimize network events such as Denial of Service (DOS) attacks Confidential and Proprietary 18

Weather Airband optimizes its fixed wireless technology to operate in severe weather conditions • Signal optimization - Engineering leverages statistical weather data to make minor signal adjustments in anticipation of severe weather • Secured installations - Network equipment can withstand gusts of up to 120 mph • Adaptive Modulation - Airband wireless equipment self adjusts for optimum signal for transmitting/receiving based on weather Confidential and Proprietary 19

Back-up Information: Voice Confidential and Proprietary 20

Hosted Vo. IP LAN Airband Network PSTN CPE Router or Switch Voice services are provided via Airband’s IP connection to the managed switching platform Confidential and Proprietary 21

Hosted Vo. IP Features STANDARD HOSTED VOIP OFFERING: • Minimum 5 stations required • Bundled with at least 2 Mbps wireless connection (or wired T 1 if wireless not available) − $0. 039/minute rate charged on all minutes over bundled amount − Lower rates are available with additional monthly minimum commitments • 911 support • Online access to Customer Support Center • Unlimited local minutes • 1 free directory listing per customer STANDARD STATION FEATURES: • Alternate numbers • Anonymous call rejection • Basic call logs • Call blocking (900 and Collect calls) • Call forwarding (always, busy, no answer, selective) • Call pick-up • Call return • 200 free domestic long distance minutes per station included (available on all desktop stations) • Call transfer • Call waiting • Caller ID (external & internal) • Comm. Pilot Call Manager • Do not disturb • Last number redial • N-way conference calling • Outlook® integration • Privacy • Priority alert/ringing • Remote office • Selective call acceptance • Selective call rejection • Sequential ring • Simultaneous ring • Speed dial 8 or 100 • Three-way calling • Voice mail • Voice portal A LA CARTE SOLUTIONS: • Auto attendant • Assistant Enterprise Toolbar • Hunt Groups Confidential and Proprietary • Music on hold • Receptionist 22

Value Proposition – Hosted Vo. IP • Capital Preservation: No large upfront capital investment for phone system • Lower Cost of Ownership: Eliminate the hassles and cost associated with maintaining an onsite phone system without giving up management control • Scalability: Flexibility to additional users and offices quickly and easily – pay for only what you need • Enhanced Productivity: Employees manage their calling features from their desktop, saving administrative resources • Maintenance Free: Airband maintains and supports the phone system • Investment Protection: Airband’s ensures our customer’s voice services can take advantage of new features and applications as they are introduced Confidential and Proprietary 23

Approved Polycom IP Phones Sound. Point IP 331 Sound. Point IP 450 Sound. Point IP 550 / 560 Sound. Point IP 650 / 670 Lobby Phone Employee Phone Manager Phone Executive Phone • 2 lines • Dual 10/100 Ethernet • 3 lines • HD Voice for higher quality • • • • • ports • Full-duplex speakerphone • 4 line x 20 character LCD • 10 dedicated hard keys, 3 context-sensitive soft keys • Headset support • Optional Cisco or IEEE Power over Ethernet voice • • Dual 10/100 Ethernet ports Full-duplex speakerphone 160 x 80 pixel LCD 13 dedicated hard keys, 4 context sensitive soft keys • Optional Cisco or IEEE Power over Ethernet 4 lines HD Voice for higher quality voice Dual 10/100 Ethernet ports – 550 Dual 10/1000 Ethernet ports - 560 Backlit display Full-duplex speakerphone 320 x 160 pixel LCD 18 dedicated hard keys, 4 context sensitive soft keys • Auto-sensing Cisco or IEEE Power over Ethernet 6 lines HD Voice for higher quality voice Dual 10/100 Ethernet ports - 650 Dual 10/1000 Ethernet ports - 670 Backlit display – 650 Color Backlit display - 670 USB port Full-duplex speakerphone 320 x 160 pixel LCD 18 dedicated hard keys, 4 context sensitive soft keys • Auto-sensing Cisco or IEEE Power over Ethernet All phones will be purchased through Airband paid for prior to installation. Pricing includes a power cord. All phones support headsets. All hardware carries a one-year warranty. Confidential and Proprietary 24

Approved Polycom IP Conference Phones Sound. Station IP 5000 Sound. Station IP 6000 Sound. Station IP 7000 Small Conference Room Phone Medium Conference Room Phone Large Conference Room Phone • • • • Full-duplex HD Voice SIP conference phone 7 -foot microphone pickup Standard 12 -key keypad 4 context-dependent soft keys 248 x 68 pixels White LED backlight IEEE 802. 3 af Power over Ethernet (built in) Full-duplex HD Voice SIP conference phone 12 -foot microphone pickup Standard 12 -key keypad 3 context-dependent soft keys 248 x 68 pixels White LED backlight IEEE 802. 3 af Power over Ethernet (built in) phone • 2 lines with Caller ID • 20 ft. microphone pickup (expandable) • White LED backlight with custom intensity control • Optional IEEE Power over Ethernet All phones will be purchased through Airband paid for prior to installation. All phones support headsets. All hardware carries a one-year warranty. Confidential and Proprietary 25

Vo. IP Lines – Analog Line Replacement LAN Airband Network CPE Router or Switch PSTN 66 Block Analog Lines PBX or Key System telephone Confidential and Proprietary telephone IP connection to an Airband managed IAD device that’s connected to the customer’s PBX that has an analog line interface 26

Analog Line Replacement Features ANALOG LINE REPLACEMENT OFFERING: • • Minimum 5 line required (except in Premier Buildings) Bundled with at least 2 Mbps wireless connection (or wired T 1 if wireless not available) Unlimited local minutes 200 free domestic long distance minutes per station included − − $0. 039/minute rate charged on all minutes over bundled amount Lower rates are available with additional monthly minimum commitments • 911 support • 1 free directory listing per customer STANDARD LINE FEATURES: • • Call waiting Caller ID Call forwarding Call park/pick-up Confidential and Proprietary • • Speed dial (up to 7) 3 -way calling Upon request: remote access call forward Upon request: voice mail – one per line 27

Value Proposition • Investment Preservation: Keep existing phone system and functionality • Lower Operating Cost: Replace high-cost LEC business lines with lower cost Vo. IP service • More Calling Features: Not restricted to 4 calling features, no additional charge for voice mail Confidential and Proprietary 28

Vo. IP Trunking – PRI Replacement LAN PRI Interface PBX IP Concurrent Call Paths telephone Airband Network PSTN telephone Confidential and Proprietary IP connection to an Airband managed IAD device that’s connected to the customer’s PBX that has standard PRI interface - 23 voice channels, 1 signaling channel 29

Vo. IP Trunking – SIP Trunking LAN SIP Interface IP PBX IP Airband Network PSTN SIP Gateway telephone Confidential and Proprietary IP interconnection to an Airband managed SIP gateway device that’s connected to the customer IP PBX that supports Session Initiation Protocol (SIP) signaling protocol 30

Vo. IP Trunking STANDARD VOIP TRUNKING OFFERING: • Minimum 5 Vo. IP Trunks (concurrent call paths) required • Bundled with at least 2 Mbps wireless connection (or two bonded T 1 s if wireless not available, special pricing required) • Local Calling • 1 free directory listing per customer • 1 Enhanced Telephone Number per Customer that will be used for 911, Caller ID and Name • 200 free domestic long distance minutes per trunk included − $0. 039/minute rate charged on all minutes over bundled amount − Lower rates are available with additional monthly minimum commitments A LA CARTE: • DIDs • Enhanced Telephone Numbers • Analog Lines • Toll Free Numbers Confidential and Proprietary 31

Vo. IP Trunking – Value Propositions • Integrated Access: voice and data services are provided over one network connection, eliminating the need to maintain separate circuits for voice and data • Dynamic Bandwidth Management: bandwidth can be dynamically allocated between voice and data traffic to help avoid waste, optimizing bandwidth usage • Cost Savings: Airband’s bundled Vo. IP trunking and data services can provide significant cost reductions to the customer’s monthly op-ex • Quality of Service: Airband’s Vo. IP services are provided on our private IP backbone and last-mile fixed wireless network, so we can provide service level guarantees Confidential and Proprietary 32

Redundant Network & Switching Infrastructure • Redundant Vo. IP Switching Architecture − Geographic Redundancy - Two Different Colocation Facility − Duplicated Servers − Dual SBC (Session Boarder Controllers) − Fully Backed-Up Voice Mail Servers • Dual Path Service Delivery (Optional) − Wireless and Wired Access Can Be Deployed − Automatic Fail-over − Truth Path Diversity Confidential and Proprietary 33

Back-up Information: Customer Logos Confidential and Proprietary 34

Customers Confidential and Proprietary 35