Linksys ATA Administration Guide
52
Configuring Dial Plans
•
Blocked number
EXAMPLE:
( [1-8]xx | 9, xxxxxxx | 9, <:1>[2-9]xxxxxxxxx | 8, <:1212>xxxxxxx | 9, 1 [2-9]
xxxxxxxxx |
9, 1 900 xxxxxxx !
| 9, 011xxxxxx. | 0 | [49]11 )
9, 1 900 xxxxxxx !
This digit sequence is useful if you want to prevent users from dialing
numbers that are associated with high tolls or inappropriate content, such as 1-900
numbers in the U.S.. After the user press 9, an external dial tone sounds. If the user
enters an 11-digit number that starts with the digits 1900, the call is rejected.
•
U.S. international dialing
EXAMPLE:
( [1-8]xx | 9, xxxxxxx | 9, <:1>[2-9]xxxxxxxxx | 8, <:1212>xxxxxxx | 9, 1 [2-9]
xxxxxxxxx | 9, 1 900 xxxxxxx ! |
9, 011xxxxxx.
| 0 | [49]11 )
9, 011xxxxxx.
After the user presses 9, an external dial tone sounds. The user can enter
any number that starts with 011, as in an international call from the U.S.
•
Informational numbers
EXAMPLE:
( [1-8]xx | 9, xxxxxxx
|
9, <:1>[2-9]xxxxxxxxx | 8, <:1212>xxxxxxx | 9, 1 [2-9]
xxxxxxxxx | 9, 1 900 xxxxxxx ! |
9, 011xxxxxx.
|
0 | [49]11
)
0 | [49]11
This example includes two digit sequences, separated by the pipe character.
The first sequence allows a user to dial 0 for an operator. The second sequence allows
the user to enter 411 for local information or 911 for emergency services.
Acceptance and Transmission the Dialed Digits
When a user dials a series of digits, each sequence in the dial plan is tested as a possible match.
The matching sequences form a set of candidate digit sequences. As more digits are entered by
the user, the set of candidates diminishes until only one or none are valid. When a terminating
event occurs, the SPA9000 either accepts the user-dialed sequence and initiates a call, or else
rejects the sequence as invalid. The user hears the reorder (fast busy) tone if the dialed
sequence is invalid.
The following explains how terminating events are processed.
Terminating Event
Processing
The dialed digits do not match any
sequence in the dial plan.
The number is rejected.
The dialed digits exactly match one
sequence in the dial plan.
•
If the sequence is allowed by the dial plan,
the number is accepted and is transmitted
according to the dial plan.
•
If the sequence is blocked by the dial plan,
the number is rejected.
