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WiFi VoIP: From Installation to Implementation PowerPoint PPT Presentation


WiFi VoIP: From Installation to Implementation David Fridley Product Manager IP Telephony Solutions Telecommunication Systems Division Phone: 949-583-3692 [email protected] Agenda What is WiFi? Deploying Voice over WiFi Cases/Examples What is WiFi? WiFi is like a meeting…

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WiFi VoIP: From Installation to Implementation

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WiFi VoIP: From Installation to Implementation

David Fridley

Product Manager IP Telephony Solutions

Telecommunication Systems Division

Phone: 949-583-3692

[email protected]


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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.

    • Don’t 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 Cordless:

  • Manage coverage area

  • Data access as well as voice

  • Interoperable with many devices

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.


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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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L2 Switch

NB

P

R

W

I

C

0

W

I

C

0

E

T

H

W

A

C

T

/

C

H

0

A

C

T

H

C

/

0

A

C

T

O

K

C

O

L

A

C

T

/

C

H

1

A

C

T

/

C

H

1

PDA

IPT

NB

CIX

Server

Branch Office

PDA

Hot Spot

Cellular

Internet

VoIP Anywhere

Broadband Modem

L2 Switch

Line Unit

(T1, DSL,,,,)

BB Router

IPT

IPT

NB

NB

Server

SoHo

PDA

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


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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 ->run->"cmd"

    • "ping -n 60 -l 160 -w 250 <IP Address>"


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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

      • < 200 Single

      • > 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 WiFiTelephony

  • 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 won’t work well…access 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 Q&A


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