VoIP uses internet to connect computer to computer, or computer to phone,without using the telephone company service. The prize is cheaper as VoIP provides us a flexible and economic system. We pay as how much we use, not how long we talk. VoIP will charge us depend on the kilobyte. When we are not talking, they will not charge us. Therefore, VoIP is more efficient when we want to call someone overseas. VoIP has 2 systems:
-Cicuit Switching: depends on how long you talk
-Packet Switching:depends on how many packets you send

Future Telephony

VoIP, or Voice over Internet Protocol, is a method for taking analog audio signals and turning them into digital data that can be transmitted over the Internet. By VoIP, you can call someone overseas with cheaper prize as it costs you on how much you talk, not how long you talk. Basically, VoIP uses internet as the media to call and bypassing the telephone company.

There are three different kinds of VoIP:
-ATA
The ATA allows you to connect a standard phone to your computer or your Internet connection for use with VoIP. The ATA is an analog-to-digital converter. It takes the analog signal from your traditional phone and converts it into digital data for transmission over the Internet.

-IP Phones
These specialized phones look just like normal phones with a handset, cradle and buttons. But instead of having the standard RJ-11 phone connectors, IP phones have an RJ-45 Ethernet connector. IP phones connect directly to your router and have all the hardware and software necessary right onboard to handle the IP call.

-Computer-to-computer
There are several companies offering free or very low-cost software that you can use for this type of VoIP. All you need is the software, a microphone, speakers, a sound card and an Internet connection, preferably a fast one like you would get through a cable or DSL modem. Except for your normal monthly ISP fee, there is usually no charge for computer-to-computer calls, no matter the distance.

Express talk protocol

what is SIP server?

The Session Initiation Protocol (SIP)

-a signalling protocol, widely used for setting up and breaking down/stopping multimedia communication sessions. Other feasible application examples include video conferencing, streaming multimedia distribution, instant messaging, presence information and online games.

- TCP/IP-based Application Layer protocol.

- designed to be independent of the underlying transport layer;

- can run on TCP, UDP, or SCTP.

- a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP)

--> allowing for easy inspection by administrators.

Uses of protocol:

1. create

2. modify

3. terminate

two-party/ multiparty sessions consisting of one or several media streams.

-The modification --------> 1. changes addresses or ports

2. invites more participants

3. adds or deletes media streams, etc.



multimedia communication sessions-->e.g voice and video calls over the Internet.

The Internet Protocol Suite (commonly known as TCP/IP)

-the set of communications protocols used for the Internet and other similar networks.

- named from two of the most important protocols in it:

the Transmission Control Protocol (TCP)

the Internet Protocol (IP)

which were the first two networking protocols defined in this standard.

How to call each other using Express talk?
1.download + install express talk
2. Install brekeke (get your SIP user name and pw)
3.using IP address of one particular computer, try to call each other by just typing their name into the space,instead of something like ziyi@(IP ADDRESS).

ziyi@(IP ADDRESS) is only needed when you try to call each other without brekeke.

Failure to call each other through brekeke and or directly using the express talk-->maybe due to firewall blockage of such functions.

The interesting thing about VoIP is that there is not just one way to place a call. There are three different "flavors" of VoIP service in common use today:
-ATA: analog telephone adaptor- The ATA allows you to connect a standard phone to your computer or your Internet connection for use with VoIP.
-IP phonaes :IP phones connect directly to your router and have all the hardware and software necessary right onboard to handle the IP call
-Computer-to-computer: There are several companies offering free or very low-cost software that you can use for this type of VoIP

VoIP

What is VoIP?
Source: http://communication.howstuffworks.com/ip-telephony.htm
Voice over internet protocol is the method for taking analog audio signal turning them into digital data that can be transmitted over the Internet. VoIP can turn a standard Internet connection into a way to place free phone calls.
Three different VoIP in common use:
1. ATA(analog telephone adaptor)
-most straightforward and is frequently used.
-connect a standard phone to your computer or your Internet connection for use with VoIP.
- An analog-to-digital converter.
Analog signal ( from traditional phone)à digital data (for transmission over the Internet.)
2. IP Phones
-- specialized phones (with a handset, cradle and buttons)
-- have an RJ-45 Ethernet connector. IP phones connect directly
3. Computer-to-computer
Needs:
a) software,
b) microphone
c) speakers
d) sound card
e) an Internet connection
all of the current circuit-switched networks will be replaced with packet-switching technology
Features of VoIP that is in VoIP
· Caller ID
· Call waiting
· Call transfer
· Repeat dial
· Return call
· Three-way calling

~end~:D

Let's try these few softphone to connect to Brekeke SIP server.

Kapanga
http://wiki.brekeke.com/wiki/Interoperability:SIP_Phones:Soft_Phones:Kapanga

Xlite
http://wiki.brekeke.com/wiki/Interoperability:SIP_Phones:Soft_Phones:X-Lite

AGEphone
http://www.ageet.com/files/AGEphone2-Setup.exe

Have you all started reading?

Hello, have you all started reading some articles after our meeting last Wednesday?