VoIP , What is VOIP?

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VoIP , What is VOIP?

• George Dallas

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Agenda

• What is VoIP?
• Why VoIP?
• Whats 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?

• VoIP Voice over Internet Protocol
• Basically, VoIP means Voice transmitted over a
  Digital Network
• Also called IP Telephony
• Standards based (e.g., H.323, G.711, G.729, RTP,
  UDP, IP, RSVP, SIP)

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What is VoIP?

• 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

• Traditional Analog Systems have tremendous
  Quality of Service Built In.
• 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 dont
• A lot of potential bandwidth is wasted
• Its 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

• VoIP Systems differ from Analog Systems
• 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
• Its 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

• IP Networks were not designed with the same
  Quality of Service as Analog Phone Networks
• IP Networks anticipate that some packets may be
  lost or delayed
• IP Networks contain provisions to request the
  re-transmission 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

• But Voice Networks cannot tolerate delay and
  missing packets
• To be effective, Voice networks require a
  continuous stream of packets
• You cant 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

• Voice is a Real-Time Application
• Delay lt 150 (ITU-G114) - 200 ms OK in
  Corporate network
• Jitter (delay variation) lt 30 ms
• Packet Loss lt 1

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Recent Advances

• Recent advances in Networking have overcome the
  Quality of Service Issues
• 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
18
Other
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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

• Lower Cost of Network Ownership
• 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
• 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

• 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
Source The META Group Multi-Client Study 2000/01
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Lower Cost of Network Ownership
Anticipated Cost Savings

• Almost 70 of survey respondents believe they
  will realize substantial to moderate
  infrastructure savings when converging their
  network
• 50 expect substantial to moderate administrative
  cost savings
• 75 expect to achieve substantial to moderate
  voice/data circuit savings

Infrastructure (Cabling, Hardware)
Administrative Streamlining
Circuit Costs (T1s, T3s)
Other
Toll Bypass
Source The META Group Multi-Client Study 2000/01
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The Basic Theory

• Put Voice, Data and Video on to one Network and
  achieve savings and flexibility
• 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
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Converged Network
Calendar
Instant Messaging
Collaboration
Web Application
Video Conferencing
Audio Conferencing
email
Telephone Services
Voice Messaging
Security
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Whats Required for VoIP Deployment?
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Data Networks

• Data Networks must be robust enough to support
  the additional Voice and possibly Video Traffic
• Remember -- if the Data Network is down, you
  cant make phone calls
• Network Architecture needs to address
• Quality of Service
• Security
• Redundancy
• Availability

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Network Switches

• 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
• VLAN Support
• QoS Support
• Security Features
• Gigabit Links
• POE
• Large Buffers

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Power

• Analog Phone Systems provide power to Phones over
  the phone cabling
• Analog Phone systems have Battery Back Up Systems
• If the Power goes off The phones still work
• VoIP Phones are powered over the Data Cable from
  the Network Switch
• Power Over Ethernet (POE)
• Requires Battery Back Up Systems (UPSs) in each
  Data Closet

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Network Cabling

• Existing Voice Category-3 Cabling cannot support
  VoIP
• 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

• Data Networks need to be re-designed
• Separate VLANs are required to segregate traffic
• Voice
• Data
• Video
• Management
• Deploy Redundant Links
• Multiple Paths
• Rapid Spanning Tree Support
• Hardware Based Routing
• L-3 switches vs. Software based Routers

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Network Security

• Firewalls should be deployed where Voice and Data
  Networks meet
• Prevent Data Network Attacks from affecting Voice
• Users should be authenticated to gain access to
  the network
• Radius Servers
• Authenticate Users
• Assign Policies
• Assign Users to VLANs based on Identity

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VoIP Systems

• Deploy standards based VoIP systems
• SIP support is a key
• 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

• Session Initiation Protocol (SIP) is an Open
  Standard signaling protocol used for establishing
  sessions in an IP Network
• 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?
Feature Consolidation!
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Why Sip?
New Applications!
MultimediaCall Center
Buddy list Push-to-talk
PresencebasedRouting
???????
Video, Chat,IM
IntelligentCallScreening
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SIP, H.323 and MGCP
Call Control and Signaling
Signaling and Gateway Control
Media
Audio/ Video
H.323
H.225
RTCP
RTP
MGCP
Q.931
RAS
SIP
H.245
RTSP
TCP
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

• For new Installations
• 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

• For existing Installations
• IP Enable your Existing PBX
• Deploy VoIP initially where needed
• Sales
• Call Centers
• Tele-workers - 1 application
• Wireless
• PDAs
• Soft Phones (Laptops)
• WoVoiP
• Implement VoIP on the WAN between Sites
• Phased approach leverage existing investment

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Reasons to Switch to VoIP

• VoIP is the Strategic Direction of Carriers and
  Vendors
• Conventional Systems will become outdated and
  expensive to maintain and upgrade
• VoIP provides a Feature Rich and Cost Effective
  Architecture
• 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

• VoIP Investment Protection
• 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
• Moves, Adds, Changes are simplified
• Converged Networks Fewer Systems

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Reasons to Switch to VoIP

• Flexibility and Portability
• IP Soft Phones
• Wireless IP Phones
• Dual Mode Cellular / Wireless IP Phones
• Key Applications
• SIP Based
• Presence Detection
• Follow Me
• Call Centers

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Reasons to Switch to VoIP

• Better Network Management
• VoIP Network Upgrades provide benefits for Data
  Users as well
• Real Time Collaboration
• Video Telephony
• Presence Detection
• Instant Messaging
• Drag and Drop Conference Calls
• Improved Bandwidth Utilization
• 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. NECs initiative is
  to facilitate the migration to IP Telephony. One
  of the essential aspects of NECs 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.
• http//www.necunifiedsolutions.com/main/Solutions

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Final Thoughts

• 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 NECs 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