service oriented voip (sovoip): true convergence of data and voice networks presented by mohammed...

Service Oriented VoIP (SOVoIP): True Convergence of Data and Voice Networks

Presented By

Mohammed Jubaer Arif

Supervisors

Dr Shanika Karunasekera and Dr Santosh Kulkarni

Department of Computer Science and Software Engineering

The University of Melbourne,

Australia.

Objective

Mohammed Jubaer Arif ([email protected])


Setup future directions in emerging innovative applications for mobile users in the developing world

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Revenue RevenueRevenue

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A Real Life Case Study

Case Study Cont.



Voice over Internet Protocol (VoIP)


What is VoIP?

VoIP, stands for Voice Over Internet Protocol, is a technology allows voice conversations to be carried over the Internet. VoIP exchanges voice information in digital form, in discrete packets rather than by using the traditional circuit-committed protocols of the Public Switched Telephone Network (PSTN).

Why VoIP?

-Price

-Flexibility

Shortcomings of VoIP

-The quality of voice is not as good as traditional telephony. It is mainly because it is susceptible to all the hurdles of Internet connection such as latency, jitter, packet loss etc.

-Failure of precise user tracking in case of emergency calling

-VoIP is dependent on wall power


Current VoIP Solutions


Constraints in Current VoIP Solutions-Not interoperable, isolated.

-Platform and language dependency, network complexity .

-Heavyweight client.

-Scalability and extendibility problem.

-NAT and firewall traversal.

-Emergency support.


SOVoIP Architecture


A Universal Connectivity

For VoIP.

Figure: Web Service Based SOVoIP Architecture.

WS

Public Node:E17 3AA 94102

DB WS

Public Node: T2N 0E6

DB

WS

Public Node:94102

DB

WS

Public Node:3053

DB

CN

CN

H

TT

PS

OA

P-

RP

C

HTTPSOAP-RPC

HTTPSOAP-RPC

HTTPSOAP-RPC

CN

CN HTTPRTP

CN-Client NodePN-Public NodeWS- Web ServiceDB-Database

HTTPRTP

SOVoIP Features•Simplicity

•Extendibility

•Mobility

•Protocol interoperability

•Quality of service (QoS)

•Security

•Conferencing

•NAT and firewall traversal

•E911 (Enhanced 911)

HTTP

SOAP-RPC

HTTP

RTP

CN1

CN2


Call Setup in SOVoIP Architecture


CN1 PN1 PN2 PN3 CN2

1. Call Query for CN2

2. DNS Search For PN3

3. Req. CN2’s Information

4. Return CN2’s Info.

5. Return CN2’s Info.

6. Request To Start Media Session

9. Acknowledgement

10. Media Session

11. End Call

12. Acknowledgement

13.Notification 14.Notification

7. Ringing / Busy

8. Off-Hook

Registration Authentication

Registration Authentication

Figure: Call Establishment In SOVoIP Architecture.

•PN1 and PN2 are the nearest public and home node for CN1 respectively

•PN3 is the home node of CN2

•CN1 completes its registration and authentication with its home node PN2 but for call setup it communicates directly to the nearest public node PN1.

•Steps 1-5 are user search.

•Steps 6-9 are call setup.

•Step 10 is real media data flow.

•Steps 11-14 ends the call.


Protocol Interoperability and SOVoIP


•Reduces network complexity

•No maintenance required

•Less bandwidth consumption

•Secure

•Do not required to parse the protocol specific messages every time.

•Users themselves can switch back and forth between SOVoIP and current protocol.


SOVoIP Business Model


Figure: SOVoIP Business Model

In the model, a mobile customer from SOVoIP makes a query to the organization. The customer query is checked with the backend office system and is redirected to appropriate customer support. The support that is external, and is behind a firewall, can still assist the customer from a soft-phone. During the support customer data is available in the soft-phone via the web service interface of the organization.


SOVoIP Benefits and Measurements


Memory Consumption

When the client listens for incoming calls in a JAVA platform: 410KB.

Number of Messages in Authentication

2 messages

Call Setup Time 1.08 seconds, including user search

Call Setup Messages

9 messages, including user search

Benefits

•Text based encoding and TCP based signaling transport

•Authentication follows HTTP basic mechanism and can be on over HTTPS.

•Firewall friendly

•Public nodes help the client nodes to traverse NAT

•Highly scalable, modular and extendible

•Backward compatible

•Ensured mobility

•Addresses emergency issue such as 911 dialing in U.S.A

•Lightweight client

•Platform independent

•Converges voice and data networks

Measurements


•Text based encoding and TCP based signaling transport

•Authentication follows HTTP basic mechanism and can be on over HTTPS.

•Firewall friendly

•Public nodes help the client nodes to traverse NAT

•Highly scalable, modular and extendible

•Backward compatible

•Ensured mobility

•Addresses emergency issue such as 911 dialing in U.S.A

•Lightweight client

•Platform independent

•Converges voice and data networks

Conclusion and Future Work


•Interoperability with PSTN

•Conferencing

•NAT and Firewall Traversal

•Localization services over IP network such as enhanced 911

SOVoIP is the architecture which will make sure internetworking between office, home and any other external information system and accessibility to these systems via the available hand held device.


Thank You!


Any Question?


For more visit: http://www.cs.mu.oz.au/~marif/

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