Call Sorting Table - 2N ATEUS 501106E User Manual

7.3. Call Sorting Table

7.3.1. Purpose
This table describes GSM Gateway's behaviour (during outgoing calls) somehow depends
on the called number. Usually, it is not difficult to recognize, according to a few first digits (the
prefix), an international call, mobile network call, special service call, emergency call, etc. It is
possible to enter a line into this table for each such group of numbers to define:
•
Call routing – PSTN or GSM
•
Whether this number can be dialled or is barred (call restriction);
•
How to detect when the dialling is complete;
•
How to bill the call (the so-called pseudo tariff metering);
•
Whether and how the called number is to be modified before being sent to the GSM
or PSTN network;
These "rules" can be written into the table, for more details see below.
7.3.2. Sorting Principle
Every table line contains one prefix (of variable length) plus parameters that describe the
behaviour of the GSM Gateway, if the beginning of the called number is identical to this
prefix. However, there is often an exception to the rule – a number that starts identically
but has to be served in a different way.
Example 1: Trunk calls usually start with 0, but international calls with 00. It is possible to define
a trunk call by one of the following three ways:
1. The trunk call starts with 01, 02, 03, 04, 05, 06, 07, 08, or 09 – very demanding.
2. The trunk call starts with 0[1...9] – a more convenient way.
3. The trunk call starts with 0, except for 00, which is an international call.
The table uses the last of the three ways cited above. There may be any number of
exceptions and the description is very easy: any table line that starts with the same
prefix but includes one or more additional digits is considered an exception.
Example 2: To bar all international calls except for calls to the Czech and Slovak Republics,
complete 3 table lines – in any sequence – as follows:
00 – international calls
00420 – Czech Republic
00421 – Slovak Republic
The said setting has the following advantages:
•
Any further line can be added any time without modifying or checking the remaining
ones. The new line becomes automatically „an exception" to any of the preceding
ones if it starts with the same prefix.
•
There may be more exceptions to one line and there may be an exception to an
exception again, etc.
Example 3:
0 – trunk calls
00 – international calls
00420 – Czech Republic
004206 – Czech Republic
In this example, there are 3 levels of exceptions, and last row shows a prefix for GSM routed
calls. Of course, there are even more complicated situations in reality. Nevertheless, the table is
still quite comprehensible.
– barred
– allowed
– allowed
– allowed, routed to PSTN
– barred
– allowed, routed to PSTN
– allowed, routed to GSM
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