Acceptance And Transmission Of The Dialed Digits - Cisco 8851 Administration Manual

Dial Plan
9, 1 [2-9] xxxxxxxxx
11-digit number that starts with 1 and is followed by a digit 2 through 9.
• Blocked number:
( [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 !
that are associated with high tolls or inappropriate content, such as 1-900 numbers in the U.S. After the
user presses 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:
( [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
that starts with 011, as in an international call from the U.S.
• Informational numbers:
( [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
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 of 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 the user enters more digits, the set of candidates
diminishes until only one or none is valid. When a terminating event occurs, the IP PBX 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 table explains how terminating events are processed.
Terminating Event
Dialed digits have not matched any sequence in the
dial plan.
Dialed digits exactly match one sequence in the dial
plan.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
66
After the user presses 9, an external dial tone sounds. The user can enter any
This digit sequence is useful if you want to prevent users from dialing numbers
After the user presses 9, an external dial tone sounds. The user can enter any number
This example includes two-digit sequences, separated by the pipe character. The first
Processing
The number is rejected.
If the dial plan allows the sequence, the number is
accepted and is transmitted according to the dial plan.
If the dial plan blocks the sequence, the number is
rejected.