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VoIP , What is VOIP?

George Dallas

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Agenda

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?

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 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

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 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

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 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

Voice is a Real-Time Application Delay < 150 (ITU-G114) - 200 ms OK in

Corporate network Jitter (delay variation) < 30 ms Packet Loss < 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?

IP Telephony Ranked Second on List of Technologies Associated with Improved Employee Productivity

IP Telephony Ranked Second on List of Technologies Associated with Improved Employee Productivity

Source: Sage Research, January 2003

Virtual Private Networks

IP Telephony

Wireless LANs

Wireless Email

Mobile Technology

Instant Messaging

Other

60%

54%

47%

30%

26%

18%18%

2%2%

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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

0%

20%

40%

60%

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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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

Email

Collaboration Calendar

Web Application

Instant Messaging

DATADATA

Video Conferencing

VIDEOVIDEO

Voice Messaging

Audio Conferencing

TelephoneServices

VOICE

email

Voice Messaging

Collaboration

Calendar

Video Conferencing

Web Application

Audio Conferencing

Instant Messaging

TelephoneServices

Converged Network

Security

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What’s 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

can’t 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?

Holdwith

Music

Directed Pickup

Call Park

GroupPickup

SharedLine

Shared Call

Appearance

Addressof

Record

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Why Sip?

Buddy listPush-to-talk

MultimediaCall Center

Presencebased

Routing

IntelligentCall

Screening

Video, Chat,IM

???????

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RTCPRTP

IP

MGCP

Call Control and Signaling Signaling and Gateway Control

Media

H.225

Q.931

H.323

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.

TCP

RAS

UDP

SIPH.245

Audio/Video

RTSP

SIP, H.323 and MGCP

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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. 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.

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 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