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operator rule 0 is also combined with this rule to reduce the
number of separate rules. However, this is done at the cost of
allowing the minimum number of digits to be just 1, following
which incomplete numbers will be sent to the service provider if
the user presses '#', or after an IDT timeout. Note the very long
(15 seconds) IDT used to guard against this latter possibility.
1Nx.2Nx.5tfxt2>#
This is a typical rule for domestic long distance dialing within the
NANP:
•
The dial pattern must begin with a 1.
•
The second digit must be in the range [2-9] This is the first
digit of the area code.
•
This is followed by two digits in the range [0–9].
•
The next digit must be in the range [2–9]. This is the first digit
of the exchange.
•
The next 5 digits must be in the range [0–9].
•
Each of the first 10 digits has an IDT of 15 seconds.
•
A final digit must be in the range [0–9].
•
The IDT for the final digit is 2 seconds.
•
The suffix character is #.
•
The minimum number of digits needed is 11, failing which the
dialed digits do not match this pattern.
The rule can be modified to accommodate other requirements.
[78]x.6t4>#
Rule for specific service provider, for example, Acme:
•
The first digit can be only 7 or 8.
•
Minimum number of digits is 7.
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