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SETTING UP DIAL-IN SYSTEM 4 (16)
Mobile Phones
3.1 21.04.99
Copyright©Nokia Mobile Phones 1999
Figure 2.2, ISDN modem access with the communicator.
Internet/
Intranet
GSM Network
cellular network’s
ISDN modem pool
ISDN modem pool
Dial-in system
DaCS (Data Communication Server) in figure 2.3, below, enables the direct DDA (Direct Digital Access)
connection from the GSM network to the Internet or to an Intranet. DaCS also provides a possibility to use ISDN
connection instead of DDA. Nokia Telecommunications has a family of products, called the Nokia Artus family and
DaCS is one part of the family. More information about the Artus family can be found at http://www.nokia.com.
Figure 2.3, Direct digital access with the communicator.
Internet
Intranet
GSM Network
DaCS (Data Communication Server) access
DDA connection
Authentication server on both ends (optional)
DDA connection
The DaCS provides a fully digital and non-modem DDA connection to the Internet or Intranet. This makes the
connection reliable with short connection times (typically up to 15 seconds). The DaCS is ideal solution to big
Internet Service Providers and large companies. Also operators have a possibility to offer services to their
customers using the DaCS.
2.2. Configuring the TCP/IP
The TCP/IP configurations can be made manually to the communicator’s Internet access point settings.
Automating the configuration can make this set-up more user-friendly.
The communicator uses IPCP (rfc1332), DHCP (rfc1541), and /or BOOTP (rfc951) for IP-address negotiations.
The dial-in system should provide Microsoft extensions for IPCP DNS negotiation (MSIPCP), BOOTP-server, or
DHCP-server for automatically configuring the communicator’s other TCP/IP settings, such as the DNS server.
The TCP/IP settings can also be sent to the communicator using a special short message containing Internet
access information, such as username, password, phone number information and scripts. The format of these
special short messages is presented in Using the Special SMS Features at http://www.forum.nokia.com.
2.3. Compression
The communicator supports V.42bis, but requires support from the GSM network and the modem called. This
support is not yet commonly provided. If this support is provided, configure the communicator end for V.42bis
through Internet Settings => Modem Initialisation section => “Autobauding with V.42bis compression”. In the call-
in-modem end the V.42bis can be set with the at command: “at+ds=3,0”.