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T226 White Paper
July 2003 (Rev C)
15
broad range of wireless networks.
Existing services can be adapted to WAP. The
necessary binary encoding is handled by a WAP
Gateway, allowing HTML-based services to be viewed
on the WAP browser of the T226. An XHTML page
can be viewed in both the WAP browser and in any
standard Web browser.
Improve productivity
A business can use a WAP gateway to provide a secure
connection to its corporate network, improving internal
communication flow by making information available
to mobile as well as office users.
The WAP profiles
A WAP profile holds network settings and user
identification, allowing the user to switch easily
between corporate services and WAP services on the
Internet, simply by switching WAP profile.
The T226 has dynamic WAP profile handling, which
means that the user can add, edit and delete WAP
profiles. The T226 has a maximum of 5 WAP profiles.
During WAP browsing, the options button on the T226
gives the user immediate access to a dynamic option
menu for WAP services, similar to a right mouse click
in PC programs.
Bearer type characteristics
The T226 accesses WAP services over IP. IP can be
provided either over GSM Data or GPRS, depending
on network services.
Typical differences which distinguish the bearer types
are listed below.
GPRS access
• The connection is maintained “constantly”, with
data transmitted in packets, and transmission
capacity being used by the application in use on
an as-needed basis.
• Higher transmission speed than with GSM Data
or SMS access.
• Pricing of GPRS can be dependent on the actual
use of bandwidth, which means the user is
charged for the volume of data transmitted,
rather than the duration of the connection.
• When transmitting large amounts of data, band-
width can be increased automatically to allow
faster transmission speed.
• Ideal for complex pull services, browsing, data
transfer, provisioning, pager services, messag-
ing services, info services, push initiations.
GSM data access
• Circuit connection of data calls, which means
that the phone is connected during the entire
WAP session.
• Pricing is comparable to that of data calls in the
network.
Gateway characteristics
A WAP Gateway provides Internet/intranet as well as
WAP services to the mobile browser. A Gateway is
identified by an IP number, depending on access type.
End-to-end gateway navigation
The WAP 2.0 supports E2E (End-to-End) Gateway
navigation, making it possible for example for a bank
to redirect its clients from the Internet gateway to its
own gateway.
Security using WAP
For certain WAP services, such as banking services, a
secure connection between the phone and WAP
gateway is necessary. An icon in the display of the
T226 indicates when a secure connection is in use.
The T226 is based on the WAP 1.2.1 specification
suite, in which security functionality is specified by a
technology called Wireless Transport Layer Security
(WTLS). The WAP protocols for handling connection,
transport and security are structured in layers, with
security handled by the WTLS layer, operating above
the transport protocol layer. WTLS classes define the
levels of security for a WTLS connection:
• WTLS class 1 – encryption with no authentica-
tion.
• WTLS class 2 – encryption with server authen-
tication.
• WTLS class 3 – encryption with both server and
client authentication.