voip

Product development courseG01

Presented to: Dr. Raafat El Fouly

1. Intro. 2. Challenges.• 2.1. Reliability.• 2.2. Service Quality.• 2.3. Fax sending.• 2.4. Emergency call handling.

3. Security. 4. Case studies 5. Applications. 6. About VoIP market.

Internet telephony is a combination of hardware and software that enables people to use the Internet as the transmission medium for telephone calls which is simply called VoIP.

Voice over Internet Protocol is both

a technology and a service.

The technology is Internet protocol.

The service is voice transmission.

1. IP networking uses a common platform for all services

◦ Information format◦ Switching hardware◦ Wiring◦ End-user hardware◦ Experience

2. Lower Cost

◦ VOIP costs less than equivalent service from traditional sources

◦ Users see VoIP phone calls (even international) as FREE

3. Make & Receive calls anywhere

◦ just... Connect to the internet

◦ and... Enjoy

ATARout

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VoIP Service Provider

Router

Internet

VoIP Service Provider

1. Intro. 2. Challenges.• 2.1. Reliability.• 2.2. Service Quality.• 2.3. Fax sending.• 2.4. Emergency call handling.

3. Security. 4. Case studies. 5. Applications. 6. About VoIP market.

1. Availability problems

1. Improve hardware and software Reliability

2. Decouple the service

◦ Hitless Pretection System (HPS)

◦ High Performance Routing (HPR)

What is QoS ?

◦ It is the probability of the telecommunication network meeting a given traffic contract, or the probability of a packet succeeding in passing between two points in the network within its desired latency period.

1. Dropped packets.

2. Delay.

3. Jitter.

4. Out of order delivery.

5. Error.

1. Upgrade your internet connection. 2. Improve your contention ratio. 3. Optimize your computer for broadband. 4. Upgrade your software. 5. Improve your WiFi signal. 6. Use a DECT phone. 7. Get a new headset. 8. Drop WiFi, use Ethernet. 9. Reduce number of calls. 10. Pause any download while on call. 11. Complain to your VoIP provider.

Main Problem:

• Fax data is a different kind of data than voice.

1.Voice data has to be delivered in real time.

2.It doesn't matter if some voice data is lost en route.

Possible solutions:

• Slowing down the speed of the data transmission.

• Using a specific codec provided by some VoIP service providers.

• Either keep a dedicated PSTN line or use one of the many e-fax services.

1. Locating the caller

Main problems:

IP addresses do not have the same geographic significance of fixed line telephones.

IP addresses are not supported by the purpose built network such as a mobile service provider's infrastructure.

.

Possible Solutions:

Mandated that VoIP service providers must provide emergency operators with the call back number and location information of their customers.

2. Emergency Call Traffic Management:

Main problems:

1. Support emergency calls at all times.

2. Allow the automatic prioritization of traffic.

Possible solution:

Supplementary RFC (RFC4412) designed to extend SIP's capability in respect to call prioritization and the allocation of resources by defining new SIP header fields that allow a device to request that the call is treated as a high priority call.

1. Intro. 2. Challenges.• 2.1. Reliability.• 2.2. Service Quality.• 2.3. Fax sending.• 2.4. Emergency call handling.

3. Security. 4. Case studies 5. Applications. 6. About VoIP market.

DoS Attacks, Viruses, and Worms VoIP spam Fraud, eavesdrop, and Sniffing Trouble at the Gateways

Encrypt VOIP traffic and run it over a VPN. Make sure you've properly configured your

firewalls segment voice and data traffic by using a

virtual LAN Use proxy servers in front of corporate

firewalls to process incoming and outgoing voice data.

Server-based IP PBXs are locked down and protected against viruses and denial-of-service attacks

1. Intro. 2. Challenges.• 2.1. Reliability.• 2.2. Service Quality.• 2.3. Fax sending.• 2.4. Emergency call handling.

3. Security. 4. Case studies. 5. Applications. 6. About VoIP market.

Case study

implementation of a PBX (Private Branch Exchange)

taps into WAN/LAN networks, allowing them to communicate with IP-enabled devices all over the world

Developers create custom interfaces to manage the PBX system

Asterisk’s open-sourced PBX system invites users who want to write their own custom-built telephony management applications

Case study

P2P infrastructure

Computer to computer/land line calls

High quality calls due to superb codec

Most Popular! It’s free!!!

Proprietary session-establishment protocol that communicates over TCP and UDP

Skype protocol is not SIP or H.323

Skype protocol is … Unknown!

1

2

3

4

It’s a mouse It’s a phone Sound chip to handle

voip softphone quality

LCD screen, caller-ID, and dialer

It looks cool

Solo allows users to make VOIP calls without a PC

Directly connects to the broadband network

Uses chipsets from Broadcom and intel’s PXA 270 CPU

Call centers connect to VOIP from home

Saves 1.3 Billion tons of CO2

Equivalent to planting a forest the size of Kent!

1. Intro. 2. Challenges.• 2.1. Reliability.• 2.2. Service Quality.• 2.3. Fax sending.• 2.4. Emergency call handling.

3. Security. 4. Case studies. 5. Applications. 6. About VoIP market.

provides on multiuser conferences without requiring users to dial in to a conference bridge.

Need for: 1-businesses needed to communicate

common 2-Financial use these networks to currency

futures and provide time-critical information

3-users of various forms of hoot and holler networks include publishers and government

Advantages: Enables businesses to eliminate expensive, protecting investments in existing hoot

and holler equipment such as turrets, bridges, and four-wire telephones.

integral component of the Cisco IP Communications system

is the software processing component of the Cisco enterprise IP telephony product line.

This software extends enterprise telephony features such as IP phones, media processing devices and multimedia applications.

Benefits:1-improved system availability , load

balancing, and scalability. 2-CAC ensures that voice QoS is maintained

across constricted WAN links and automatically diverts calls to alternate PSTN routes when WAN bandwidth is not available.

routing of PSTN inbound calls directly to the PBX subscriber extension.

Main Benefits:1- Enables normally unavailable DID service

for KEY system users without additional lines or

trunk connections to the PSTN2- Single area dialing plan enabled country-

wide or world-wide.

The access fee that enterprises are required to pay to wire line operators, whenever they call cellular subscribers

Main Benefits:1- Reduce the number of required cellular

gateways2- Reduce access costs related to calls to

cellular subscribers via the wire line network

3- Audio Codes provides end-to-end integrated working solutions

1. Intro. 2. Challenges.• 2.1. Reliability.• 2.2. Service Quality.• 2.3. Fax sending.• 2.4. Emergency call handling.

3. Security. 4. Case studies. 5. Applications. 6. About VoIP market.

Better price of communications. The success of the broadband. Better price of equipment. The emergence of increasingly rich

interpersonal communications services combining voice, images, instant messaging, collaborative work etc.

"Light" regulation of VoIP services. Reliability. Security.

USA.◦ No 911 calls.

Egypt.◦ Data transfer only.

Panama.◦ Higher tax.

Ethiopia.◦ Criminal offence.

UAE.◦ Illegal to use !!!

Why VoIP is an open market ready to flourish.

How fast is the projected market growth.

How will VoIP affect other markets.