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

3. 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

4. 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

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

6. 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

7. 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

8. 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

9. 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

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

11. 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 e defines reservation and polling based mechanisms
Wi-Fi Alliance WMM is based on e drafts

12. 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)

13. 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

14. Wi-Fi Telephony Implementation Issues
Voice quality
Security
Roaming
Functionality
Capacity
Enterprise users expect business telephone functionality
Multiple lines or extensions, display features, voic 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.

15. 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

16. 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

17. 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

18. Thank you