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2-42 Reference Guide
Note: If the actual calling number and entered calling number do
not have the same number of digits, CNA can still match the
numbers. The smaller number determines how many digits must
match. For instance, if the actual calling number is 10 digits and
the entered calling number is 7 digits, only 7 digits must be
matched. The 7 digits that must be matched in this example are
the last 7 digits of each calling number. In this example then, the
first 3 digits of the actual calling number will be ignored. This
method allows the actual calling number to include prefixes and
area codes without requiring the entered calling number to
include them.
Calling numbers can also be matched using the wildcard
character, ?, which will match any digit. For example, if you enter
555-123? in the Calling Number field, the following actual calling
numbers will be matched: 555-1231, 555-1232, 555-1233,
555-1234, 555-1235, 555-1236, 555-1237, 555-1238,
555-1239, and 555-1230.
Using CNA can also provide cost savings because calls are not
billed during the CNA phase. With CNA, a caller can set up a
connection to the Netopia Router without incurring any charges by
accessing a dial-back connection profile. If the caller’s rates are
higher than those charged to the Netopia Router’s return call,
then using CNA has saved the difference.
CNA should be available where CallerID services are available.
You will need to consult with your telephone service provider to
find out if your line is provisioned for CallerID.
Also note that if the calling side has instructed the phone
company to block delivery of its caller ID, the answering side will
not be able to authenticate.
North America models
only
If you have a Northern Telecom DMS-100 line (either Custom or
NI-1) you should verify that the line supports “Calling Number
Delivery" service.
If your line is an AT&T 5ESS (either custom or NI-1) verify that it
supports "CPN/BN (Calling Party Number/Billing Number)
Delivery" service.
If your line does not support the appropriate service, CNA may
not work properly.