2. Introduction to WiFi Telephony
Mobility in the enterprise is quickly becoming a major consideration on a customer’s wish list. As more companies investigate the costs and benefits of wireless communications, they face a number of questions specific to deploying This session will discuss many of these issues, including network security, delivering enterprise-specific features throughout an network, technical considerations when integrating into an existing converged infrastructure, and vendor-neutral practical applications.
David Fridley, Product Manager, IP Telephony Solutions
Toshiba America Information Systems, Inc.
Digital Solutions Division

3. Agenda Practical Applications Deploying WiFi Telephony
Technical considerations when integrating WiFi into an existing converged network
Security
Enterprise specific features over WiFi

4. WiFi Telephony VoIP is an application that runs on IP networks
Voice over WiFi is a natural step in this evolution
First, there were Soft Phones on PCs
Then came WiFi on Laptops
WiFi Telephony was born

5. Practical Applications: Benefits
Ability to be connected to the phone system even if users are not at their desks
Compared to cordless
Manage coverage area
Data access as well as voice
Compared to cellular
WiFi cost is part of the network infrastructure expense, distributed over the whole business. Cellular is a variable expense. (Companies don’t get Cellular for all their employees)

6. Practical Applications: End Points
Taking your Laptop with you (WiFi in building)
Management by walking around
Meetings
Taking your Laptop on the Road (WiFi hotspots)
Soft phone running on your Laptop
Soft phone running on your PDA
WiFi telephony devices

7. Practical Applications: Segments
Horizontal
Addition to rather than replacement of desktop phone
Managers
People who report to managers
Administrators
Vertical
Health Care
Warehouse
Retail

8. Practical Applications: IT Dept.
IT departments tends to have many technicians dispersed around the company fixing peoples problems
These technicians are seldom at their desks
WiFi telephony allows these technicians to communicate with IT Management, and each other in a more timely and more direct fashion
Company doesn’t have to pay for cell phone service

9. Deploying Voice Over WiFi
Good enough for data is not good enough for voice
Wireless Network Assessment
Coverage and other concerns
Testing the network
Security

10. WiFi WiFi Standard 802.11b 802.11g 802.11a Data Rate 11Mbps 54Mbps
Separate Channels 3 8
Distance at full rate
197 feet
66 feet
82 feet
Band
2.4GHz
5GHz
End-point devices
IP Phones, PDAs, Laptops
Laptops
Laptops*

11. Deploying Voice Over WiFi
A voice ready WiFi network should have 99+% packets getting through
Quick Test
Start ->run->"command"
"ping -n 60 -l 160 -w 250 <IP Address>"
Figure on 7-10 active calls per Access Point
Single Subnet or Multiple Subnets?
How many users/wireless users
< 200 Single, > 1000 Multiple
Network Assessment and AP Placement

12. Voice Over WiFi: Expectations
About 7 – 10 active calls per access point
Difficult to prevent too many calls
Currently no mechanism for prioritizing voice traffic over data traffic over the air (waiting for e)

13. Security
MAC Address Filtering
WEP
802.1x
WPA
IP-SEC VPN
Guest Access

14. Network Topology IPT Anywhere Internet SoHo Office Hot Spot PDA NB
Branch Office
Server
IPT
CIX
L2 Switch P W R O K I C A T / H 1 E L
PDA NB
PSTN
Internet
Server
L2 Switch
Line Unit
(T1, DSL,,,,)
BB Modem
SoHo
IPT NB
BB Router
IPT
PDA NB
PBX
Office

15. Enterprise Specific Features
Ability to tie into your IP based phone system and get provide all the desktop phone feature to a wireless device
Hold and Transfer
Call Announce
Paging
“Line 1”
Guests
Remote/Mobile Employees

16. The Future of WiFi Telephony
Combination WiFi Cell Phones
Quality of Service
Preparing for the future

17. Audience Q&A