Transcript Slide 1

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
802.11. This session will discuss many of these issues, including network security,
delivering enterprise-specific features throughout an 802.11 network, technical
considerations when integrating 802.11 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
949-583-3692
[email protected]
Agenda
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Practical Applications
Deploying WiFi Telephony
Technical considerations when integrating WiFi into an
existing converged network
Security
Enterprise specific features over WiFi
WiFi Telephony
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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
Practical Applications: Benefits
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Ability to be connected to the phone system even if users
are not at their desks
Compared to cordless
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Manage coverage area
Data access as well as voice
Compared to cellular
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Manage coverage area
Data access as well as voice
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)
Practical Applications: End Points
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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
Practical Applications: Segments
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Horizontal
 Addition to rather than replacement of desktop phone
 Managers
 People who report to managers
 Administrators
Vertical
 Health Care
 Warehouse
 Retail
Practical Applications: IT Dept.
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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
Deploying Voice Over WiFi
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Good enough for data is not good enough for voice
 Wireless Network Assessment
 Coverage and other concerns
 Testing the network
 Security
WiFi
WiFi Standard
802.11b
802.11g
802.11a
Data Rate
11Mbps
54Mbps
54Mbps
Separate Channels
3
3
8
Distance at full rate
197 feet
66 feet
82 feet
Band
2.4GHz
2.4GHz
5GHz
End-point devices
IP Phones,
PDAs, Laptops
Laptops
Laptops*
Deploying Voice Over WiFi
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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
Voice Over WiFi: Expectations
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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 802.11e)
Security
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MAC Address Filtering
 WEP
 802.1x
 WPA
 IP-SEC VPN
 Guest Access
Network Topology
PW
R AC
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00 A
W
00 A
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T/C
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C
TIC
H
/C
C
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K A
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CT/C
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1A
CT/C
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1 C
L2
Switc
h
NB
PDA
PSTN
CIX Server IPT
Branch Office
N
B
Hot Spot
P
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Internet
IPT Anywhere
BB
Modem
Line Unit
(T1, DSL,,,,)
L2 Switch
BB Router
PBX
Server
Office
IPT
NB
NB
PDA
IPT
SoHo
Enterprise Specific Features
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Ability to tie into your IP based phone system and get
provide all the desktop phone feature to a wireless
device
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Hold and Transfer
Call Announce
Paging
“Line 1”
Guests
Remote/Mobile Employees
The Future of WiFi Telephony
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Combination WiFi Cell Phones
Quality of Service
Preparing for the future
Audience Q&A