T68i
White Paper, April 2002
22
viewed on the WAP browser of the T68i. 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 T68i has dynamic WAP profile handling,
which means that the user can add, edit and
delete WAP profiles. The T68i has a maximum of
5 WAP profiles.
During WAP browsing, the options button on the
T68i gives the user immediate access to a
dynamic option menu for WAP services, similar to
a mouse right-click in PC programs.
Bearer type characteristics
The T68i 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,
bandwidth can be increased automatically
to allow faster transmission speed.
•
Ideal for complex pull services, browsing,
data transfer, provisioning, pager services,
messaging services, info services, push ini-
tiations.
GSM data access
•
Circuit connection of data calls, which
means that the phone is connected during
the entire WAP session.
•
Higher transmission speed than with SMS
access.
•
Pricing is comparable to that of data calls
in the network.
•
Suitable for complex pull services, brows-
ing and data transfer.
•
Not suitable for provisioning, pager ser-
vices.
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-toEnd) 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 T68i indicates when a secure
connection is in use.
The T68i is based on the WAP 2.0 (WML 1.3)
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 authen-
tication.
•
WTLS class 2 – encryption with server
authentication.
•
WTLS class 3 – encryption with both server
and client authentication.
Server authentication requires a server certificate
stored at the server side and a trusted certificate
stored at the client side.
Client authentication requires a client certificate
Summary of Contents for T68i
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