Embed Size (px)
Citation preview
Deploying Wi-Fi Telephony in the
EnterpriseBen 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 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
Enterprise:
Business features Investment protectionSecurityVoice quality
Consumer:
PersonalizationObsolescenceEase of useNetwork ubiquity
Strategic Impact
Mobility requirements 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 DecisionsPDAs as phones
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 PerspectivesEnterprise Wi-Fi telephony overlaps the
traditional telecom and datacom worlds
Dumb terminalClass of serviceExtensionsFeature assignments
Application platformSecurity & accessUser assignmentFrequent updates
9
Workplace Wireless RequirementsEnd 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
Enterprise Wi-Fi Telephony Implementation Issues
Voice quality
Security
Roaming
Functionality
Capacity
Wi-Fi Telephony Implementation Issues
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
Voice quality
Security
Roaming
Functionality
Capacity
Wi-Fi Telephony Implementation Issues
“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
schemesStandards
WFA’s WPA/WPA2 with pre-shared key is acceptable
Secure roaming techniques still necessary (802.11r)
Voice quality
Security
Roaming
Functionality
Capacity
Wi-Fi Telephony Implementation Issues
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
Voice quality
Security
Roaming
Functionality
Capacity
Wi-Fi Telephony Implementation Issues
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.
Voice quality
Security
Roaming
Functionality
Capacity
Wi-Fi Telephony Implementation Issues
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
Voice quality
Security
Roaming
Functionality
Capacity
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 $0 $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
Thank you
www.spectralink.com
