ZyXEL Communications P-335WT - Manual (Page 256)

P-335 Series User’s Guide
256 Chapter 20 Media Bandwidth Management
20.1.6.2 VoIP (SIP)
Sending voice signals over the Internet is called Voice over IP or VoIP. Session Initiated
Protocol (SIP) is an internationally recognized standard for implementing VoIP. SIP is an
application-layer control (signaling) protocol that handles the setting up, altering and tearing
down of voice and multimedia sessions over the Internet.
SIP is transported primarily over UDP but can also be transported over TCP, using the default
port number 5060.
20.1.6.3 FTP
File Transfer Program enables fast transfer of files, including large files that may not be
possible by e-mail. FTP uses port number 21.
20.1.6.4 E-Mail
Electronic mail consists of messages sent through a computer network to specific groups or
individuals. Here are some default ports for e-mail:
POP3 - port 110
IMAP - port 143
SMTP - port 25
HTTP - port 80
20.1.6.5 eMule/eDonkey
These programs use advanced file sharing applications relying on central servers to search for
files. They use default port 4662.
20.1.6.6 WWW
The World Wide Web is an Internet system to distribute graphical, hyper-linked information,
based on Hyper Text Transfer Protocol (HTTP) - a client/server protocol for the World Wide
Web. The Web is not synonymous with the Internet; rather, it is just one service on the
Internet. Other services on the Internet include Internet Relay Chat and Newsgroups. The Web
is accessed through use of a browser.