2. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Introduction to WiFi Telephony Thursday - 10/12/06, 8:30-9:15am David Fridley, Product Manager, IP Telephony Solutions Toshiba Digital Solutions Division 949-583-3692 David.Fridley@tais.toshiba.com

3. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Agenda What is WiFi? Deploying Voice over WiFi Cases/Examples

4. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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.

5. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

6. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

7. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

8. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

9. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Network Topology/User Mobility Office PSTN Internet PBX IPT Hot Spot PDA NB VoIP Anywhere Broadband Modem SoHo IPT NB BB Router Line Unit (T1, DSL,,,,) Server L2 Switch PDA NB PDAPDA NBNB Cellular Branch Office Server IPT PBX L2 Switc h P W R OK WIC0 ACT/CH0 ACT/CH1 WIC0 ACT/CH0 ACT/CH1 ETH ACT COL

10. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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.

11. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

12. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California WiFi WiFi Standard 802.11b802.11g802.11a802.11n (Apr 2008) Data Rate11Mbps54Mbps 100Mbps+ Separate Channels 33812+ Distance at full rate 197 feet66 feet82 feet Band2.4GHz 5GHz End-point devices IP Phones, PDAs, Laptops Laptops, Newer IP Phones Laptops

13. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Bigger or Faster 24 Users / 11Mbps = 460 Kbps per user Max ~7 VoIP calls 24 Users / 22Mbps = 920 Kbps per user Max ~14 VoIP calls

14. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Voice Over WiFi: Expectations About 7 – 10 active calls per access point (802.11b) –G.711 takes 202.4 kbps in each direction –G.729 takes 146.4 kbps in each direction Difficult to prevent too many calls Need to prioritize voice traffic over data traffic over-the-air WiFi WMM™

15. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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 "

16. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

17. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

18. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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!)

19. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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

20. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California 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)

21. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Example: Wireless Network Assessment 50,000 sq-ft facility ~120 users 802.11b access points

22. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Coverage Signal Strength of A Signal Strength of B Minimum coverage throughout campus Minimum strength required by device at full speed A B Level device searches for new AP

23. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Example: Wireless Network Assessment

24. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Example: Wireless Network Assessment

25. www.itexpo.com October 10-13, 2006 San Diego Convention Center, San Diego California Audience Q&A