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White Paper T610/612
23
Bearer type characteristics
The T610/612 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 vol-
ume 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 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 the 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 T610/612
indicates when a secure connection is in use.
The T610/612 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 authentication.
• WTLS class 2 – encryption with server authentica-
tion.
• WTLS class 3 – encryption with both server and cli-
ent authentication.