Sami Aly 1 Packet Voice8 January 2002 Packet Voice Business & Technology Annapurna South.

Packet Voice Sami Aly 18 January 2002

Packet VoiceBusiness & Technology

Annapurna South


AHAs !

I was told to add this page ; so I did

• In the 70’s digital switching was an AHA• In the 80’s ISDN was an AHA• In the 90’s Internet was an AHA• Is packet voice one of the AHA of the 2000’s

– Why it took that long– Is it the technology or the business– What in it to make an AHA


The Talk

• What is Packet Voice

• Drivers

• Where $ can be made

• Business opportunities

• Barriers

• Technology behind

• Product Examples and Applications

• Where we are

• Conclusions


What is it . . ?• Media (Transport & Switching)

– Use packetized voice instead of regular 64kb/s PCM– Use packet data network instead of TDM circuit switched network– Use packet routing/switching (IP, ATM, MPLS,..) instead of circuit

switching (DMS or 5ESS)

• Control (call control)– Control call setup within packet network– Guarantee QoS that is not naturally available– Use Internet-style distributed control engines {e.g. softswitch}

instead of centralized vertically-integrated circuit switches– Use standard open protocol {SIP, MGCP,..}

• Applications (features)– Subscriber management, value-added, OAM&P– Create new value-added features leveraging packet nature


Packet Voice Network Architecture (vision)

AccessPacket

Network

Core PacketNetwork

SS7

Feature Servers

SignalingGW

IP phone

PremiseRouter

NetworkEdge

Gateway

Call Agent(softswitch)

Feature Servers

Would it ever be that ; when, . .In the mean time . . .

Would it ever be that ; when, . .In the mean time . . .


Enterp

rise

Packe

tNet

work


Voice Network Architecture: Now and near future (PSTN/NGN)

AccessNetwork

Core PacketNetwork

PSTN

Class 3/4

Class 5

SS7

Feature Servers


SignalingGW

TrunkGW

Call Signaling: MGCP, H.248Bearer Management: MGCP, H.248

PBX/KTS

RouterT1 CAS

ISDN PRI

MGCP, H

.248,

SIP

SIP phone

GR-303ISDN PRI

PremiseGateway

NetworkEdge

Gateway

One exampleHeterogeneous Network

One exampleHeterogeneous Network

IP-PBX


Puzz words• VoIP: Voice over IP• VoATM: Voice over ATM• AAL2: ATM adaptation layer #2 used heavily for

compressed voice transport• SGW: Signaling gateway• MGW: Media gateway• TGW: Trunk gateway• IAD: Integrated access device• SS7: Signaling system #7• CodecG.711. G.726, G.729, G.723• NGN: Next Generation Network (packet voice network)• Softswitch, call agent, call control

» Did you have enough ????


Drivers for Packet voice• Mainly 2 Big vendors for major circuit switching equipment in NA

(monopoly) • Circuit switches are vertically integrated & becoming too

big ;expensive to maintain and to add features to• Two networks: expensive to maintain & evolve• Voice makes the $ Data takes the bandwidth• Technology availability (or about)• Voice market is still there and growing• Packet voice promised:

– Break down centralized architecture allowing competition– Bandwidth saving where it is expensive– Use of one unified network ; reducing cost– Leverage un-used capacity in existing packet data network– Lower cost technology– Offer newer features not easily available with circuit switching

Competition Lower cost

Revenue +


Where can $ be made• Service Providers

– Offer same service with a lower cost – Generating new revenue from new features

• Equipment vendor– Legacy equipment replacement– Mediation opportunities in the heterogeneous network– Development of new features

• Best where Packet voice has a generic advantage:– Where bandwidth is scarce– Network is growing & expensive– Operating cost is expensive

Core, Switching, Access, Enterprise


Business Opportunity Example 1Toll Bypass

• Trunk gateway• Opportunity: Lower cost alternative for

expensive long distance telephony trunks.– Sell to long distance carrier for Class 4

(Tandem) Bypass in the Backbone network – More attractive for Overseas trunks– Relies on PSTN (Class5) for network access – Can offer low cost tie lines for Enterprise

Private network using PBX (entry strategy !!) create a short term opportunity

– Pure cost reduction (bandwidth reduction)– Possible newer feature for additional revenue– Current alternative have been around & capital

has been depreciated.– There may be a low quality perception for end

users

Core PacketNetwork

PSTN

PSTN

TrunkGW

TrunkGW

SignalingGW

SignalingGW

TrunkGW

TrunkGW

SS7


Example 1 (cont.)

• Transport facilities are in existence• gateway for PSTN-packet network interworking

(for media & Signaling)– Technological issues

» Speech coding & Silence suppression» Echo cancellation» Signaling interworking (IP to SS7)» ATM vs. IP


Business Opportunity Example 2 Softswitch

“A Softswitch is software utilizing open standards which can perform distributed communications functions on an open computing platform.”

Opportunity: A technology and a network architecture that enables entery into a BIG market that was a monopoly to offer a reduced cost, feature rich alternative to customers with low capital investment


Example 2 (cont.)


Business Opportunity Example 3 Packet in the Access (VoDSL)

• CLEC Packet Access market for SME end users• CLEC lease unbundled loops to access SME from ILEC. • End user need for multiple voice connection.• Existing loop is practically the means for most most SME access. T1 is expensive

and may be more than needed.• Service provider opportunity: avoid leasing T1 from ILECs. Lease unbundled loop

and a CoLo.• Equipment vendor opportunity: IAD, GR303 gateway

IADIAD

AccessNetwork

AccessNetwork GR303

gateway

GR303gateway

PSTN

PSTN

DSLAM


Business Opportunity Example 4Packet in the Enterprise

• IP-PBX

• Enterprise or campus application

• Integrated voice & data & video

• QoS enabled network

• Voice is all packet

• Connection to PSTN

• Multi-site private network

• Usually very feature-rich

PSTN

PSTN


Business Opportunity Example 5 Packet in the Access (VoDSL)

• CLEC Packet Access market for SME end users

• CLEC lease unbundled loops to access SME from ILEC.

• End user need for voice & data.

• Existing loop is practically the means for most most SME access

• How many phone extensions & PC connections can we jam on one loop

• Service provider opportunity: Bundled voice & data package

• Equipment vendor opportunity: IAD, GR303 gateway

IADIAD

AccessNetwork

AccessNetwork GR303

gateway

GR303gateway

PSTN

PSTN

DSLAM

IP phone

Same as #3 but with voice & Data


Business Opportunity Example 6 Voice features

Telephone feature market was a monopoly for switch vendors only. Switches are vertically integrated and feature implementation was proprietary.

Opportunity: By enabling NGN network architecture, feature development is opened for new entrant. Reproducing existing telephony features and creating new features are available. Required capital investment is not prohibitive.

This opportunity is piggybacked on the network architecture being enabled. It is encouraged by the customer for enhance competitiveness.


Other Opportunities

• Opportunities enabled by new network architecture:– Voice gateways (Consumer market) – 3rd gen DSLAM (Carrier market)– IP/ SIP Phone

• Piggyback on other business initiatives

• Community of vendors

• Standard committees help


• Network reliability (Bell heads vs. Net heads)– Availability (Fault tolerance, down time/yr, Redundancy)

• Scalability• Voice quality

– Reality, Perception• Matching Legacy technology (PSTN) features

– ??? (911, wire taping,..), centrex features• Lack of mature OAM&P• Resistance from legacy product equipment vendor• Interworking with Legacy PSTN

Up-the-hill barriers


What new Technology• Packetizing voice

– Speech coding

– Echo cancellation

– Silence suppression

– Voice quality measurements

• Packet network with high performance– Packet loss

– Delay

– Jitter

• Multi-media networks and Network equipments– QoS


Some techi Jargon• Packet voice sent as compressed or uncompressed voice

frames of few to 10’s msec long. Silence may not be sent.• Quality degradation due to packet loss (few %), latency

(>100msec noticeable) & jitter (>10msec eats away from latency)

• On the DSP• Implement echo canceller since delay is high enough

• Implement jitter buffer

• Implement packet loss replacement

• On the Network• Implement QoS

• Reserve bandwidth (circuit emulation !!)


Some techi Jargon• Voice Packets Sent over a connection-oriented (ATM, APLS) or

connectionless (IP, Ethernet) networks• Voice over IP

– RTP/UDP/IP high overhead unless multiplex.

• Voice over ATM– AAL1 CBR (circuit emulation)– AAL2 RT-VBR : highly efficient

• With payload, send time stamp, sequence no., ID,..• Two ends negotiate resources (codec, SS, ..)• Voice packet are typically small 100 octets or so• Signaling is similar to Q.931 (used in PSTN)• Voice over DSL

– Use DSL bandwidth to send multiple derived voice channels over DSL link– Typically voice integrated with data


Packet Voice in the Access

MGW

Access Network

Access NetworkPacket IADPacket IAD

QoSEnabled

Edge Switch

QoSEnabled

Edge Switch

Voice Next Gen (packet) Network

Voice Next Gen (packet) Network

Data network Data network

PSTN

PSTN

Data CPE

PSTN GatewayM

edia Gatew

ay

Data services Platform

Call Agent

MUX

TGW

Mu

lti S

ervi

ce p

rovi

der

C

ore

Net

wor

ks

ISP

E-commerceInternet

CL5 switch

En

d U

ser

En

terp

rise

LOOP

SGW

CL3/4 switch

GR303ISDN PRI

CAS

TDM IAD


Packet voiceBit

signaling

Packet media

Bitsignaling

Class 5

Packet voice

MGCPsignaling

Softswitch

TDMlink

TDMvoiceBit

signaling

TDM

link

TDMlink

Packet IAD

TDM IADOr PBX

Customer mediaGateway

IP (SIP) Phone

Mediation

IP

IP

IP

IP

IP

Access Flavors and migration

TDM

IPATM


IAD

Telephone

PB

X

analog voice ports• (POTS / FXS / centrex)• GR303, CAS to PSTN• MGCP to NGN

digital voice port

• CAS, ISDN PRI to PSTN

• MGCP to NGN

10/100BT ports

Network uplink• ATM-sDSL, Frame R-sDSL• ATM-T1 & Ethernet

Fax

I

DS

X1

SIP

Analog

SIP Phone

Router

Media gateway isSimilarCommunicates with a softswitch Not with a GR303 gateway


0

10

20

30

40

50

60

70

80

90

100

1997 1998 1999 2000 2001 2002 2003 2004

Total Value-addedServices Revenue($ billion)

Total Call Revenue($ billion)

Packet Voice Service Provider Market

(Source: Dataquest, March 2000)

Total WW Public Packetized Basic and Value-add Revenues ($ billion)


What is packet voice• Unmatched Performer (U.P.)• Obvious Updates to Technology (O.U.T.)• Disruptive Upstart (D.U.)• Disruptive Innovator (D.I.)

TimePer

form

ance

Legacy=PSTN

UPOUT

DI

DU

Disrup

tive

?


Commercial PhaseDidn’t cross the casimNot yet into volume

Packet Voice is disruptiveTo TDM circuit switching

It is in Commercial PhaseDidn’t cross the chasm yetLots of $$ behind

Don’t believe will ever eliminate TDM/PSTN

It is a whole network evolution ; implemented in parts

–Why it took that long–Is it the technology or the business–What in it to make an AHA

Sami Aly 1 Packet Voice8 January 2002 Packet Voice Business & Technology Annapurna South.

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Transcript of Sami Aly 1 Packet Voice8 January 2002 Packet Voice Business & Technology Annapurna South.