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number. An offnet number is different from other dialed number types; the
first digit ranges from two to nine and the second digit is a zero or one (as
shown in Table 7-4).
Table 7-4
Offnet dialing digits
Type of dialed number
10-digit direct dialed digit (DDD)
International direct dialed digit (IDDD)
Note: N=2–9; Y=0 or 1; X=0–9
To differentiate between offnet numbers and other types of address digits,
the pretranslator must be datafilled to perform 3- or 6-digit pretranslations to
distinguish the NYX-NXX (or NXX) as an off-net number. The pretranslator
used is determined on a per-call-type basis and is datafilled in table
CALLATTR.
A pretranslator result of CT OFFNET indicates that the address digits apply
to an offnet number. The pretranslator result also indicates the minimum
number of digits that should be received in an incoming SETUP message.
Failure to receive the minimum number of digits results in Partial Dial
(PDIL) treatment.
DDD dialing
A direct distance dialing offnet number is entered directly by a subscriber or
is retrieved from a speed list. (For more information on speed dialing, see
"Public speed dialing" in this chapter.)
IDDD dialing
International direct distance dialing allows subscribers to place calls to
locations outside of North America without operator assistance. An IDDD
number consists of the international access number (011), the country code
(CC) (1–3 digits), and the national significant number. Table 7-5 shows the
maximum number of digits allowed.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Feature interaction 7-13
Interpretation
NYX-NXX-XXXX
011+CC+NX...X
—end—
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