Deploying Wi-Fi Telephony in the Enterprise Ben Guderian SpectraLink Corporation

Enterprise Wi-Fi Telephony Cordless and cellular technologies are not suited for enterprise environments Coverage Reliability Telephone system integration Cost Wi-Fi and VoIP technologies are lowering cost of deployment Return on investment Soft dollars: productivity, responsiveness, customer service Hard dollars: wiring costs, MAC

Target Markets Vertical markets General enterprise markets Compelling need for telephone communication among a mobile workforce Return on investment based on productivity, responsiveness, and customer satisfaction General enterprise markets Opportunity to leverage economies of Wi-Fi and VoIP technologies

Enterprise vs. Consumer Priorities Business features Investment protection Security Voice quality Consumer: Personalization Obsolescence Ease of use Network ubiquity

Strategic Impact Mobility requirements Infrastructure implementation Telephone support for mobile data device users Enable true “mobile workplace” Infrastructure implementation Leverage investment in wireless network Interoperability allows “best of breed” solutions Return on investment Productivity gains Reduced downtime or lost time Reduced wiring costs Competitive advantages

Device Decisions PDAs as phones Phones as data devices General issues Audio capabilities – many don’t support full-duplex audio Acoustics – limited by form factor Wi-Fi functionality – minimal security, no QoS, poor roaming, poor power management Cellular functionality – not bad Phones as data devices Limited user interface, display size OS, processor and memory limitations Good for messaging applications General issues PBX functionality Security Administration and management

Management and Administration Perspectives Enterprise Wi-Fi telephony overlaps the traditional telecom and datacom worlds Dumb terminal Class of service Extensions Feature assignments Application platform Security & access User assignment Frequent updates

Workplace Wireless Requirements End user Access to critical information Corded voice quality throughout Telephone switch features Ease of use, minimal training Workplace-sensitive ergonomics, durability Information Systems / Telecom Scalability for various applications and future expansion Leverage existing infrastructure Easy to maintain Privacy and security 3

Enterprise Wi-Fi Telephony Implementation Issues Voice quality Security Roaming Functionality Capacity

Wi-Fi Telephony Implementation Issues Voice quality Security Roaming Functionality Capacity QoS is a must-have for Wi-Fi telephony Voice applications have little tolerance for delay and jitter Availability, reliability, and quality must be nearly equivalent to wired telephones for enterprise use QoS implementation impacts voice quality, capacity, and battery life QoS solutions SpectraLink SVP “stopgap” has broad industry support IEEE 802.11e defines reservation and polling based mechanisms Wi-Fi Alliance WMM is based on 802.11e drafts

Wi-Fi Telephony Implementation Issues Voice quality Security Roaming Functionality Capacity “All or nothing” security approach poor for voice Significant interruptions for authentication process during handoff User interface and usability issues Good interim solutions are available Policy-based access control using MAC address Separate VLAN for voice devices Voice-friendly proprietary schemes Standards WFA’s WPA/WPA2 with pre-shared key is acceptable Secure roaming techniques still necessary (802.11r)

Wi-Fi Telephony Implementation Issues Voice quality Security Roaming Functionality Capacity Comprehensive coverage is critical for voice applications Voice devices are used everywhere – stairways, smoking areas, bathrooms, etc. Voice users are highly-mobile Within the Wi-Fi network Roaming between wireless LAN access points must be transparent Subnet roaming requires solution to maintain VoIP call To/from cellular network Possible with dual-radio devices Various enterprise and carrier-based solutions available

Wi-Fi Telephony Implementation Issues Voice quality Security Roaming Functionality Capacity Enterprise users expect business telephone functionality Multiple lines or extensions, display features, voicemail integration Enterprise telephone integration VoIP standards offer minimal functionality, inconsistent levels of support SIP, MGCP, H.323 Proprietary VoIP protocols offer richest functionality, but unique implementation for every switch platform Cisco SCCP, Nortel Unistim, Avaya CCMS, Mitel MiNet, etc.

Wi-Fi Telephony Implementation Issues Voice quality Security Roaming Functionality Capacity Network factors: Access point bandwidth Density of access points Reservation for data applications VoIP factors: Sampling rate Codec Protocol overhead Real-world implementation 802.11b supports up to 12 simultaneous calls; sufficient for 30+ users in typical enterprise applications 802.11a can meet high density applications

Wired vs. Wireless Office Costs Traditional Wired Office Wireless Office Telephone set $350 (enterprise-grade IP deskset) $500 (enterprise-grade IP handset w/ accessories) Wireless Network $0 $60 ($600 AP for 10 users) PC Wireless NIC $50 Cable Installation $300 ($150 each for data and phone line) $15 ($150 per AP for 10 users) TOTAL $650 $625

Summary Different users need different devices Opportunities to innovate, exploit niches Enterprise management issues must be considered Today’s Wi-Fi technology addresses enterprise challenges QoS, security, capacity Enterprise Wi-Fi and VoIP adoption will drive costs down Meanwhile vertical market opportunities will continue to dominate Standards will lower costs, drive innovation Network TCO will continue to drop with lower equipment cost, better management and administration Resistance to truly open VoIP protocol will maintain current enterprise market paradigm

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