Transcript Document

VoIP , What is VOIP?
George Dallas
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Agenda
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What is VoIP?
Why VoIP?
What’s Required for VoIP Deployment?
Need for SIP
Recommendations
What the Vendors are Saying
Q/A
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What is VoIP?
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What is VoIP?
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VoIP = “Voice over Internet Protocol”
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Basically, VoIP means Voice transmitted over
a Digital Network”
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Also called IP Telephony
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Standards based (e.g., H.323, G.711, G.729,
RTP, UDP, IP, RSVP, SIP)
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What is VoIP?
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VoIP is the latest in a long series of actions to
change voice transmission from an all analog
to an all digital network
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Traditional Analog Systems
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Traditional Analog Systems have tremendous
Quality of Service Built In.
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They assign a dedicated end-to-end connection
for each pair of users
These connections could carry more than just a
voice connection -- but they don’t
A lot of potential bandwidth is wasted
It’s like having your own personal Limo – ready to
take you anywhere at a moments notice
Very Good service – but not very efficient
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VoIP Systems
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VoIP Systems differ from Analog Systems
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They convert voice into packets and then mix
several conversations onto the same wires (IP
Networks)
These circuits can also carry data packets as well
An efficient use of bandwidth
It’s like having a fleet of shared taxis
Make efficient use of resources – but you could
still end up standing in the rain trying to catch a
taxi
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IP Networks
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IP Networks were not designed with the
same Quality of Service as Analog Phone
Networks
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IP Networks anticipate that some packets may be
lost or delayed
IP Networks contain provisions to request the retransmission of missing packets
From a data standpoint, a user may wait an extra
second for a web page to load
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Need for Quality
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But Voice Networks cannot tolerate delay and
missing packets
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To be effective, Voice networks require a
continuous stream of packets
You can’t have a random series of 2-3 second
delays in the middle of a sentence and have an
effective conversation
This lack of Quality of Service initially proved to be
a barrier to the mainstream adoption of VoIP
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Need for Quality
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Voice is a Real-Time Application
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Delay < 150 (ITU-G114) - 200 ms OK in
Corporate network
Jitter (delay variation) < 30 ms
Packet Loss < 1%
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Recent Advances
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Recent advances in Networking have
overcome the Quality of Service Issues
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Protocols have been developed to provide an
adequate level of service and quality
Network Switching equipment has evolved to give
Voice traffic priority over Data traffic
Virtual Local Area Networks (VLANs) can
segregate Voice and Data traffic
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Why VoIP?
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Which Technologies Will
Drive Employee Productivity?
Virtual Private Networks
60%
IP Telephony
54%
Wireless LANs
47%
Wireless Email
30%
Mobile Technology
26%
Instant Messaging
Other
18%
2%
IP Telephony Ranked Second on List of Technologies Associated
with Improved Employee Productivity
Source: Sage Research, January 2003
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Key Customer Drivers for IP
Communications
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Lower Cost of “Network”
Ownership
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Cost savings are the primary
short-term reason to converge
voice, data and video onto a
single IP network
This reflects the impact of the
slowing economy on IT
investment
Enhanced Business
Communications
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Creating new revenue streams
and deploying new applications
that can increase productivity
or enhance customer care are
seen as significant and as
longer term benefits of
convergence
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Aggregate View on Drivers
60%
40%
20%
0%
1st — 428
2nd — 397
3rd — 344
To drive cost savings (easier infrastructure mgmt.)
To drive revenues
To enable additional application capabilities
Other
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Source: The META Group Multi-Client Study 2000/01
The Basic Theory
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Put Voice, Data and Video on to one Network
and achieve savings and flexibility
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Eliminate redundant Networks
Consolidate IT Staff
Simplify Administration and Maintenance
Reduce hardware
Reduce cabling – 1 cable for voice and data
Reduce WAN Charges
Converged Networks are the key
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Disparate Networks
Calendar
Collaboration
Audio
Conferencing
DATA
VOICE
Voice
Messaging
Web
Application
Email
Instant
Messaging
Telephone
Services
VIDEO
Video
Conferencing
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Converged Network
Calendar
Collaboration
Instant
Messaging
Video
Conferencing
email
Voice
Messaging
Security
Telephone
Services
Web
Application
Audio
Conferencing
What’s Required for VoIP
Deployment?
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Data Networks
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Data Networks must be robust enough to
support the additional Voice and possibly
Video Traffic
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Remember -- if the Data Network is down, you
can’t make phone calls
Network Architecture needs to address
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Quality of Service
Security
Redundancy
Availability
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Network Switches
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If your Data Network is more than 3 years old
it may not be able to support VoIP
Newer Layer-2 and Layer-3 Switches are
designed to support VoIP
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VLAN Support
QoS Support
Security Features
Gigabit Links
POE
Large Buffers
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Power
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Analog Phone Systems provide power to
Phones over the phone cabling
Analog Phone systems have Battery Back Up
Systems
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If the Power goes off – The phones still work
VoIP Phones are powered over the Data
Cable from the Network Switch
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Power Over Ethernet (POE)
Requires Battery Back Up Systems (UPSs) in
each Data Closet
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Network Cabling
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Existing Voice Category-3 Cabling cannot
support VoIP
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Requires new cables for existing installations
Minimum of one Category-5e Cable for all users
VoIP can reduce cabling costs for new
deployments
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Network Architecture
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Data Networks need to be re-designed
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Separate VLANs are required to segregate traffic
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Deploy Redundant Links
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Voice
Data
Video
Management
Multiple Paths
Rapid Spanning Tree Support
Hardware Based Routing
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L-3 switches vs. Software based Routers
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Network Security
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Firewalls should be deployed where Voice
and Data Networks meet
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Prevent Data Network Attacks from affecting
Voice
Users should be authenticated to gain access
to the network
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Radius Servers
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Authenticate Users
Assign Policies
Assign Users to VLANs based on Identity
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VoIP Systems
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Deploy standards based VoIP systems
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SIP support is a key
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Instruments
Signaling
System Servers should be distributed
Determine if a Hybrid approach works best
for you
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Need for SIP
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SIP
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Session Initiation Protocol (SIP) is an Open
Standard signaling protocol used for
establishing sessions in an IP Network
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It is a catalytic protocol that delivers key signaling
elements that can turn a VoIP Network into a true
IP Communications Network
It replaces older and proprietary signaling
protocols
It enables multiple vendors to interoperate
It enables new services to be easily added
Enables Presence Based Capabilities
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Why Sip?
Hold
with
Music
Shared
Call
Appearance
Shared
Line
Address
of
Record
Directed
Pickup
Group
Pickup
Call
Park
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Why Sip?
Buddy list
Push-to-talk
???????
Multimedia
Call Center
Video, Chat,
IM
Presence
based
Routing
Intelligent
Call
Screening
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SIP, H.323 and MGCP
Call Control and Signaling
Signaling and
Gateway Control
Media
Audio/
Video
H.323
H.225
H.245
Q.931
RAS
SIP
MGCP
TCP
RTP
RTCP
RTSP
UDP
IP
H.323 Version 1 and 2 supports H.245 over TCP, Q.931 over TCP and RAS over UDP.
H.323 Version 3 and 4 supports H.245 over UDP/TCP and Q.931 over UDP/TCP and RAS over UDP.
SIP supports TCP and UDP.
SIP leverages other protocols.
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Recommendations
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Recommendations
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For new Installations
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Deploy a Converged Network
Deploy VoIP System
Deploy Advanced L-2 and L-3 Switches
Take advantage of Reduced Cabling
Requirements
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Recommendations
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For existing Installations
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IP Enable your Existing PBX
Deploy VoIP initially where needed
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Sales
Call Centers
Tele-workers - #1 application
Wireless
 PDAs
 Soft Phones (Laptops)
 WoVoiP
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Implement VoIP on the WAN between Sites
Phased approach – leverage existing investment
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Reasons to Switch to VoIP
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VoIP is the Strategic Direction of Carriers and
Vendors
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Conventional Systems will become outdated and
expensive to maintain and upgrade
VoIP provides a Feature Rich and Cost
Effective Architecture
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New features and services will be added to VoIP
Systems
Competitive Pressures will force many Industries
to Upgrade to keep pace
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Reasons to Switch to VoIP
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VoIP Investment Protection
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IP Enable Existing Systems
Take advantage of new features where you need
them now
Migrate based on budgets and business needs
VoIP can Reduce Maintenance Expenses
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Moves, Adds, Changes are simplified
Converged Networks = Fewer Systems
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Reasons to Switch to VoIP
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Flexibility and Portability
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IP Soft Phones
Wireless IP Phones
Dual Mode Cellular / Wireless IP Phones
Key Applications
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SIP Based
Presence Detection
Follow Me
Call Centers
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Reasons to Switch to VoIP
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Better Network Management
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Real Time Collaboration
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VoIP Network Upgrades provide benefits for Data
Users as well
Video Telephony
Presence Detection
Instant Messaging
Drag and Drop Conference Calls
Improved Bandwidth Utilization
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Converged WAN Links for Voice, Data and Video
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NEC on IP Telephony
“IP Telephony is growing throughout the world as communications
decision makers begin to take advantage of the potential cost
savings afforded by converged infrastructures. NEC’s initiative is
to facilitate the migration to IP Telephony. One of the essential
aspects of NEC’s strategy is honoring our commitment to
investment protection for our customers. Therefore we have "IP
enabled" our existing line of traditional PBXs, Key Telephone
Systems and Document Solutions so that our customers can
enjoy the cost savings of IP Telephony without rendering
obsolete their existing systems.
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http://www.necunifiedsolutions.com/main/Solutions
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Final Thoughts
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Avoid the Hype
One approach, which is hotly debated in the VoIP
market, is to rip out your old PBX, phones and wiring
and replace everything with IP phones. That might
work in some cases, particularly where the old PBX
is long past its expiration date, but it isn't always the
best approach.
Consider deploying IP Telephony based on a
Phased Approach – See NEC’s migration strategy
With a carefully targeted VoIP deployment you can
achieve 70% of the ROI with 30% of the investment
Understand the benefits that the technology offers,
not just the costs
Have a Plan
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