1.
Voice over WLAN Overview
Girish Bhat
October 14, 2008

2.
Agenda
 Enterprise VoIP Mobility
- Drivers and Benefits
- Key Enablers / Inhibitors
- Solution Overview
 Fixed Mobile Convergence
- What Does It Mean?
- State of the Market
 Customer Case Study
- Drivers
- Requirements
- Benefits Realized
 Summary
- Adoption Predictions
Meru Networks Confidential

3.
VoWLAN: Market Trends
 Represents two of the fastest growing technologies in IT
 Increasing availability of Wi-Fi enabled handsets
WLAN Infrastructure for VoIP Mobility Market Size And Forecast
2005-2009 CAGR = 92% WLAN Revenue
Wi-Fi Handset Units
$M
1,400 35,000
Market for VoIP Mobility
Wi-Fi Handset Unit (000)
1,200 30,000
WLAN Infrastructure
1,000 25,000
Shipments
800 20,000
600 15,000
400 10,000
200 5,000
- -
2005 2006 2007 2008 2009
Meru Networks Confidential
Source: Infonetics Research, Internal Analysis

4.
VoWLAN: Strong Benefits to Enterprise
 Mobility & Productivity Benefits
 Anywhere, anytime access to applications
 Single handset, single number
 Cost Benefits
 Moves, add, change costs
 Lower wiring and equipment costs
 Lower telecom costs
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5.
VoWLAN : Requirements
 Requirements for robust, high-quality voice
- Low end-to-end delay
- Low jitter (variable packet arrival)
- Voice codecs expect consistent intervals on packets arrivals, eg. one
packet per 20 ms
- Low packet loss  every packet lost is a small portion of audio typically
a 20-40ms audio duration
 Metrics for Voice Quality
- Mean Opinion Score (MOS) commonly used for voice quality
- MOS range is 1-5; >3.6 is cellular quality; >4 is PSTN toll quality
Meru Networks Confidential

6.
VoWLAN : Protocols
 Call Control Protocols in use on VoWLAN handsets
- SIP is most common for WiFi and WiFi+GSM (dual-mode phones)
devices
- SpectraLink Voice Protocol for Polycom/SpectraLink handsets
- utilizes proprietary modifications to 802.11, requires AccessPoint
vendors to implement support
- Vendor-proprietary phones that use PBX call-signaling protocols
 Audio protocols and codecs in use
- Real-time Transmission Protocol (RTP and its companion RTCP) for
transport of digital audio samples
- Voice Codecs predominantly G.711 (20ms or 30ms) or G.729
Meru Networks Confidential

7.
Network Components for Deployment of VoWLAN
 Wired LAN
- 100BaseT/1000BaseT switched Ethernet, Traffic Prioritization
 Wireless LAN
- Pervasive coverage across enterprise for seamless roaming
- QoS mechanisms due to shared medium unlike the switched LAN
 PBX System
- IP PBX system, utilizing SIP (or alternate VoIP protocol on handsets)
- Digital PBX in addition to VoIP Gateway interfacing with T1/PRI trunk for VoIP
functionality for Wi-Fi handsets
 VoWLAN Handsets
- Handsets selected to match deployment application
- Supporting selected PBX protocol – SIP, H.323, Proprietary
- Dedicated single-mode phone (Wi-Fi radio) or dual-mode phone (Wi-Fi and
cellular radios)
Meru Networks Confidential

8.
Hitachi-Cable
WIP-3000
HTC P3600
Nokia e70 (GSM)
RIM BlackBerry
Dopod D810
7270
Sony Ericsson
P990 (GSM)
Dual-Mode Phones (802.11 and GSM/CDMA)
UTStarcom F1000
Wi-Fi Voice Endpoints Have Arrived
Single-Mode Phones (802.11)
Nokia e61 (GSM)
Meru Networks Confidential
SpectraLink i640
Nokia e60 (GSM)
SpectraLink e340
Cisco 7920
Samsung i730 (GSM)
Vocera Badge
Qtek 2020 (GSM)
Hitachi-Cable
WIP-5000 NEC N900iL (FOMA)

9.
VoWLAN : Key Challenges
How to design a reliable network for
voice applications?
Reliability
Does the
Does the
network meet
system identify VoWLAN
low latency,
handsets and Voice
allow me to Management
jitter, packet
Quality loss
identify active
requirements
phones/calls?
Call Admission Voice Protocol and offer MOS
> 3.6?
Control Awareness
How to control Can the network
network access and recognize voice
load balancing protocols (SIP, RTP/
during peak RTCP, SVP) and
network usage? apply QoS?
Meru Networks Confidential

10.
Toll-Quality Voice over WLAN available today
1 802.11g AP
• 28 VoIP Conversations
• 8 Data Clients
Meru Networks Confidential

11.
Building a Solution
Outside Enterprise Inside Enterprise
Cellular
Network
BlackBerry®
Nokia
Dual-mode phone
Hitachi-Cable
WIP-5000
Access Point
PSTN
Ch
ann
el 1
Vir
tua
lCe Ascom
ll
i75 Handsets
SIP PBX
Wireless LAN Controller
Access Point
Example Deployment Options:
Industrial/Healthcare Applications Ascom, Polycom
IP-PBX Basic WiFi VoIP Handset WIP-5000
with SIP
“Corridor Warrior”, IT Staff Blackberry, Moto
Mobile, Multi-site Worker Nokia, HTC, HP iPaq
Meru Networks Confidential

12.
FMC: An Overloaded Term
 What is FMC (Fixed-Mobile Convergence)
- Use of a single device for getting calls (and applications) inside an
Enterprise campus and outside (productivity)
- Using some lower-cost, higher-bandwidth network (Wi-Fi) where available
and using cellular elsewhere (cost)
- Phone number (and applications) remain under Enterprise control (control)
 Elements of the Solution
- Handset
- Application on Handset
- “FMC” Server adjacent to a PBX
Meru Networks Confidential

13.
Realizing FMC : 3-ways
 “Hair-pinning”
- Single-mode handset with application to provide PBX-capability
- E.g. Avaya, Cisco clients on Nokia phones
- Productivity advantages but no cost advantages
 Carrier-based
- Dual-mode handset
- FMC “server” is in carrier networks
- PBX can be hosted or on premise
- Capability dependent on carrier offering service, type of handsets and their billing plans
 Enterprise-based
- Dual-mode handset
- FMC “server” in Enterprise-network and managed by IT
- No dependency on carriers offering the service
- Enterprise controls choice of handsets, number owned by Enterprise, no-cost when over
Wi-Fi
- Full benefits realized: productivity, cost, control
Meru Networks Confidential

14.
What is driving FMC in enterprises?
∆ 14% increase in mobility of
workforce by deploying FMC
Meru Networks Confidential

15.
All-Wireless Enterprise: Example
 World’s Largest dual-mode
phone + data deployment
- $9B Public Utility
- 15K employees
- 50 offices
- 6000 dual-mode
WiFi/cellular;
3000 WiFi only phones
- 1000s of laptops
- “Address-free” offices:
voice and data connectivity
anywhere
- True one-number access: calls running
over WLAN indoors, cellular outdoors
Meru Networks Confidential

16.
Number of extension telephones
Fax, Other
1,000
Office Fax, Other
1,000
extensions
11,000 Fixed IP Phone
Total
16,000 Total
Wireless IP Phone
11,000
Mobile Phones Dual-mode
4,000 Phones
PRESENT After IP
Phone
deployment
Meru Networks Confidential

17.
Significant Cost Benefits Realized
Meru Networks Confidential

18.
Predictions : Wireless VoIP in the Enterprise
 Drivers
- Mobility benefits
- Single number
- Lower costs
- Improved coverage
 Where is Wireless VoIP Today ?
- Primarily Single-mode Wi-Fi Deployments
- Phase 1: In Enterprises where workforce is mobile within campus
- Healthcare, Retail, Warehousing, Factories
 Future of Wireless VoIP
- Both single mode and dual-mode (Cellular+WiFi) devices
- Phase 2: Enterprise with workforce mobile within campus and outside: Insurance
companies, Utilities, professional services, healthcare
- Phase 3: General Enterprise for coverage, cost, productivity reasons
Meru Networks Confidential