IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Organisation Remarks
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automatically routed. All other incoming faxes have to be manually redirected
to the recipients. Another problem is that there are no constraints on the choice
of originator identification by senders of faxes, so that sometimes these are not
a reliable form of identification.
c) Signalling using ISDN
Where ISDN is used, additional possibilities for automatic fax routing are
available. A distinction must be made here between "point-to-multipoint
connections" and the system connection.
With a point-to-multipoint connection, 2 lines and up to 10 call numbers are
available per connection. The call numbers are issued by the relevant
telephone company. As long as the fax server is equipped with an ISDN card
or a fax card with ISDN interface, the recipient can be determined on the basis
of the call number used by the sender. Due to the upper limit of 10 call
numbers, it is only possible to distribute incoming faxes to a maximum of 10
recipients.
With an ISDN system connection, a private branch exchange is switched
between the public telephone network and the organisation's internal
telephone network. With this type of connection the fax server can detect the
call number used by the sender and route an incoming fax automatically to the
appropriate recipient on the basis of this number. The maximum possible
number of recipients is considerably higher with this solution. It is
implemented by giving every person expected to receive incoming faxes from
the fax server a second direct dial number. The PBX forwards incoming faxes
which arrive on this second number directly to the fax server. The only
disadvantage of this approach is that the organisation requires a larger pool of
call numbers, so that the private branch exchange needs to have a high
capacity.
d) Processing and interpretation of the recipient using optical character
recognition
Another, but little used method of automatically routing incoming faxes is to
use optical character recognition (OCR). An attempt is made here to recognise
names or numbers contained in the incoming fax, e.g. in the address field.
This solution requires powerful OCR software and appropriate computing
power as well as relying on maximum use of standard address fields in the
incoming faxes.
e) Other procedures
There are two other procedures for automatic routing of incoming faxes, the
Dual Tone Multi-Frequency procedure and the Direct Inward Dialling
procedure However, as neither method is usable in Germany, they are simply
mentioned here for the sake of completeness.
Automatic routing of incoming fax transmissions has the advantage of
reducing the workload of staff in the fax mail centre. It also means that
incoming fax transmissions reach the intended recipient more quickly. The
main disadvantage when ISDN signalling is used is that heavy demands are
placed on the pool of call numbers. On the other hand this is the most effective
way of implementing automatic routing of incoming fax transmissions. When
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IT-Baseline Protection Manual: Oktober 2000
Automatic routing with
high fax volume