Acceptance And Transmission Of The Dialed Digits - Cisco 7800 Series Administration Manual

Acceptance and Transmission of the Dialed Digits

• Informational numbers:
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.
A timeout occurs.
A user presses the # key or the dial softkey on the IP
phone screen.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
66
( [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 )
After the user presses 9, an external dial tone sounds. The user can enter any number
9, 011xxxxxx
that starts with 011, as in an international call from the U.S.
( [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 )
This example includes two-digit sequences, separated by the pipe character. The first
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.
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.
The number is rejected if the dialed digits are not
matched to a digit sequence in the dial plan within the
time that the applicable interdigit timer specifies.
The Interdigit Long Timer applies when the dialed
digits do not match any digit sequence in the dial plan.
Default: 10 seconds.
The Interdigit Short Timer applies when the dialed
digits match one or more candidate sequences in the
dial plan. Default: 3 seconds.
If the sequence is complete and is allowed by the dial
plan, the number is accepted and is transmitted
according to the dial plan.
If the sequence is incomplete or is blocked by the dial
plan, the number is rejected.
Cisco IP Phone Installation