Published Summary

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Published Summary

• WiFi VoIP From Installation to Implementation
  (W-02)
• Thursday - 01/26/06,  1230-115pm
• In this session, users can expect to learn about
  WiFi in a VoIP application, from installation to
  successful implementation. The presenter will
  cover network assessments (making sure the
  wireless network is ready for voice), advantages
  of WiFi, and troubleshooting your VoWiFi system.
  Other topics of conversation will include
  advantages of WiFi, types of wireless phones
  (mobile, softphones, mobile/cellular combos), and
  the future of WiFi. The speaker will provide
  successful case studies and give an example of a
  successful VoWiFi install.

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WiFi VoIP From Installation to Implementation
David Fridley Product Manager IP Telephony
Solutions Telecommunication Systems Division
Phone [phone] David.Fridley_at_tais.toshiba.co
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Agenda

• What is WiFi?
• Deploying Voice over WiFi
• Cases/Examples

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What is WiFi?

• WiFi is like a meeting
• When the moderator speaks, everyone listens.
• If you want to speak, listen and wait for the
  current speaker to finish before speaking.
• Dont interrupt someone who is speaking.
• If you were not heard, wait and try again.

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WiFi Telephony

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

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Comparison with Other Technologies

• Ability to be connected to the phone system
• even if users are not at their desks

• Compared to Cellular
• Manage coverage area
• Data access as well as voice
• Cost of WiFi is part of the network
  infrastructure expense, distributed over the
  enterprise. Cellular is a variable expense.

• Compared to Cordless
• Manage coverage area
• Data access as well as voice
• Interoperable with many devices

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Enterprise - Specific Features

• Ability to tie into your IP-based phone system
  and provide all desktop phone features to a WiFi
  device
• Hold
• Transfer
• Call Announce
• Line 1
• Guests
• Remote/mobile employees

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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

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Network Topology / User Mobility
PSTN
PBX
Office
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Special Needs of WiFi Telephony

• Voice wants all the packets to get through right
  away.
• Voice needs a fixed amount of bandwidth.
• If that is not possible, voice is not possible.

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Deploying Voice Over WiFi

• Good enough for data is not good enough for Voice
• Special needs of Voice
• Wireless network assessment
• Coverage and other concerns
• Testing the network
• Security

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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
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Bigger or Faster
24 Users / 22Mbps 920 Kbps per user Max 14
VoIP calls
24 Users / 11Mbps 460 Kbps per user Max 7
VoIP calls
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Voice Over WiFi Expectations

• About 7 10 active calls per access point
• Difficult to prevent too many calls
• Need to prioritize voice traffic over data
  traffic over-the-air WiFi WMM

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Quick Test for a WiFi Network

• A voice-ready WiFi network should have at least
  99 packets getting through
• Quick Test
• Start -gtrun-gt"cmd"
• "ping -n 60 -l 160 -w 250 ltIP Addressgt"

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Security

• Prevent unauthorized access to the enterprise
  network over the WiFi network
• Prevent unauthorized access into wireless
  computers over the wireless network and the
  Internet
• Guest Access to the Internet?
• Fast handoff when moving from one Access Point to
  the next

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IP Sub-netting

• Single Subnet or Multiple Subnets?
• How many users/wireless users
• lt 200 Single
• gt 1000 Multiple
• When crossing from an AP in one subnet to
  another, the voice session will disconnect
  because the device IP address changes.
• Mobile IP
• Wireless Switch

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The Future of WiFi Telephony

• Dual Mode WiFi/Cell Phones
• Carrier dialing plan on the WiFi network
• Enterprise dialing plan on the Cellular network
• Quality of Service
• SIP based access control
• 802.11e based access control (this year!)

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Keys to Successful WiFi Telephony Implementation

• Plan in advance for coverage
• Types of endpoints
• How many access points and where
• Bandwidth requirements
• Consider QoS for Voice
• WMM minimum
• Plan for access control
• Security that does not impact Voice
• Consider the mobility needs of employees
• Assess the wireless network

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Cases

• Dentist Office uses WiFi to link two neighboring
  offices together, installing IP phones in the
  remote office
• Furniture Store uses WiFi and IP desk phones to
  enable quick and easy reconfiguration of show
  rooms
• Travel Agency lets people work from home, and
  provides 24 hour support
• Florist has IP desk phones, but employees need to
  be able to move around and still be part of the
  call group
• Manufacturing facility has a steel building, so
  cordless phones wont work wellaccess points on
  low power installed to provide better coverage
  (still being evaluated)

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Example Wireless Network Assessment

• 50,000 sq-ft facility
• 120 users
• 802.11b access points

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Example Wireless Network Assessment
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Example Wireless Network Assessment
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Audience QA