SS-16 VoIP-2-GSM USER MANUAL
DOC. NO: SS-16-14 (REV. 02)
Page 81 of 84
dynamic, interactive, permanently updated. Routers learn about the network topology
by communicating with other routers so it may select a better route, optimized for
each time period.
S-HTTP
- Acronym for SECURE HYPERTEXT TRANSFER PROTOCOL. A secure
way of transferring information over the Web, by using an application-level encryption
scheme. S-HTTP is an extension of the normal HTTP with security enhancements for
WWW-based commerce. Web pages that use S-HTTP have a URL starting with
https://. Typically HTTP data is sent over TCP/IP port 80, but HTTPS data is sent over
port 443. The standard was developed for secure transactions, and uses 40-bit
encryption ("weak" encryption) or 128-bit ("strong" encryption). The HTTPS standard
supports certificates and allows encryption, digital signatures, authentication, or any
combination of these. The S-HTTP type of transaction security is more secure than a
user ID and password, thus it is mostly used by financial institutions (for example for
credit-card purchases over the Web). Since SS-16 VOIP-2-GSM provides ensures S-
HTTP, this means a higher degree of security for you.
SMS
-
Acronym
for
Short Message Service
; means the transmission of short text messages to
and from cellular phones. The messages must be text only (no images or graphics) and not longer
than 160 alpha-numeric characters. Operators of Mobile Phone Networks use a spare data
channel to send SMS messages. You may send SMS messages to another mobile subscriber, the
mobile operator can send you phone settings over-the-air or commercial companies may send
dedicated content to your mobile terminal. The embedded firmware allows SS-16 VOIP-2-GSM to
send and receive SMS (via mobile network) from the computer connected to it.
Static packet filter
- One of the simplest and least expensive forms of firewall
protection is known as static packet filtering. With static packet filtering, each packet
entering or leaving the network is checked and either passed or rejected depending
on a set of user-defined rules. Dealing with each individual packet, the firewall applies
its rule set to determine which packet to allow or disallow. The static packet filtering
firewall examines each packet based on the following criteria:
* Source IP address
* Destination IP address
* TCP/UDP source port
* TCP/UDP destination port
Static packet filtering is easy to implement and configure and does not use a lot of
resources, but its efficiency is limited. Basic packet filtering firewalls are susceptible to
IP spoofing, where an intruder tries to gain unauthorized access to computers by
sending messages to a computer with an IP address indicating that the message is
coming from a trusted host. Another shortcoming is that this form of firewall rarely
provides sufficient logging or reporting capabilities.
SIP
– Acronym for
Session Initiation Protocol
- a protocol proposed standard for
initiating, modifying, and terminating an interactive user session that involves
multimedia elements such as video, voice, instant messaging, online games, and
virtual reality. It is one of the leading signalling protocols for Voice over IP, along with
H.323. SS-16 VOIP-2-GSM is used for VoIP calls that use the SIP protocol.
SIP clients traditionally use TCP and UDP port 5060 to connect to SIP servers and
other SIP endpoints. SIP is primarily used in setting up and tearing down voice or
video calls. However, it can be used in any application where session initiation is a
requirement. These include Event Subscription and Notification, Terminal mobility and
so on. There are a large number of SIP-related RFCs that define behaviour for such
applications. All voice/video communications are done over separate transport
protocols, typically RTP.
TCP/IP
– Acronym for Transmission Control Protocol / Internet Protocol. It was
established by the Defense Department of the USA for communications between
computers. It has been at first incorporated in Unix operating system but has become
the de facto standard for data transmission via networks, including for Internet.
Currently TCP/IP is the basic communication language or protocol of the Internet, but
it can also be used as a communications protocol in private network. TCP/IP uses the
client/server model of communication in which a computer user (a client) requests
and is provided a service (such as sending a Web page) by another computer (a
server) in the network. TCP/IP is a two-layer program. The higher layer, Transmission
