Setting Up Allowed Lists 4 - AT&T MERLIN 3070 Administration Manual

Setting Up Allowed Lists
Call restriction by allowed lists adds a group of permitted numbers to the calling range
of an outward- or toll-restricted voice terminal. Permitted numbers consist of an area
code, an exchange code (the first three digits of a 7-digit telephone number), both
codes, or an emergency number such as 911.
For example, a customer service representative in New York City (area code 212) with
atoll-restricted voice terminal might need to speak with customers in northern New
Jersey (area code 201). This person should have area code 201 in his or her allowed
list. A clerk in Houston with an outward-restricted voice terminal might need to call
several local vendors and the company's headquarters in Chicago. The clerk's
allowed list would include the first three digits of the local vendors' telephone numbers
and the area code and first three digits of the firm's Chicago telephone number.
"Assigning Allowed-List Call Restrictions," the section that follows, explains how to
assign allowed lists to restricted voice terminals.
You can establish up to eight allowed lists (which you number 0 through 7), each with
a maximum of ten entries (which you number 0 through 9). Before you begin setting
up allowed lists, fill out an Allowed-List Directory for each allowed list, using the form
provided on page 170.
NOTE: If you use Automatic Route Selection (ARS), you may have digit absorption
entries in your ARS tables. These codes instruct the system not to dial certain digits
that the caller dialed when it places calls on line pools containing FX or tie lines. If
you include in an allowed list an area code and/or exchange to which digit absorp-
tion applies, be sure to enter in the list on/y those digits that the system actually disk
to place the call.
For example, say that you have an FX line pool for exchange 531 in area code 303.
You have administered ARS with digit absorption so that the system absorbs the 1
and the 303 dialed by the caller and dials only 531 and the last four digits of the
telephone number when placing calls to this exchange. If you want to allow restricted
voice terminals to call numbers in this area code and exchange, you would enter "531"
in an allowed list, not '303531 ."
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