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.