Algs Supported In Oa-700 - Alcatel-Lucent OmniAccess 700 Cli Configuration Manual

ALG S
S UPPORTED IN
These ALGs (Application Level Gateway) can be used only in conjunction with
NAT. The ALGs supported in OA-700 are listed below.
SIP
The Session Initiation Protocol (SIP) is an application-layer control protocol that
can establish, modify, and terminate multimedia sessions such as Internet
telephony calls. SIP can also invite participants to already existing sessions.
Media can be added to or removed from an existing session.
A SIP network consists of proxy servers, redirect servers, registration servers and
user agents (UA). For the UA which initiates the session, we call it user agent
client (UAC). The party which accepts the invitation from UAC, we call it user
agent server (UAS). For the purpose of discussion, we call redirect, registration
and proxy servers "SIP servers". SIP is actually a signaling protocol for setting up
sessions between clients over the network. These sessions do not necessarily
have to be Internet telephony sessions.
OmniAccess supports SIP as a service and can screen SIP traffic, allowing and
denying it based on a policy that you configure. SIP is a predefined service in OA-
700 and uses port 5060 as the destination port.
DNS
Domain Name System (or Service or Server) (DNS) is an Internet service that
translates domain names into IP addresses. Because domain names are
alphabetic, they're easier to remember. The Internet however, is really based on
IP addresses. Every time you use a domain name, therefore, a DNS service must
translate the name into the corresponding IP address. For example, the domain
name www.example.com might translate to 198.105.232.4.
The DNS system is, in fact, its own network. If one DNS server doesn't know how
to translate a particular domain name, it asks another one, and so on, until the
correct IP address is returned.
FTP
File Transfer Protocol (FTP) is the protocol for exchanging files over the Internet.
FTP works in the same way as HTTP for transferring Web pages from a server to
a user's browser and SMTP for transferring electronic mail across the Internet in
that, like these technologies, FTP uses the Internet's TCP/IP protocols to enable
data transfer.
FTP is most commonly used to download a file from a server using the Internet or
to upload a file to a server (e.g., uploading a Web page file to a server).
CLI Configuration Guide
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OA-700
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ALGs Supported in OA-700

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