Operation Manual

Advanced Options for Voice Services
Configuring Dial Plans
Administration Guide 143
1
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 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 ATA 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 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.
A timeout occurs. The number is rejected if the dialed digits are not matched to
a digit sequence in the dial plan within the time specified by
the applicable interdigit timer.
• The Interdigit Long Timer applies when the dialed
digits do not match any digit sequence in the dial
plan. Default setting: 10 seconds
• The Interdigit Short Timer applies when the dialed
digits match one or more candidate sequences in the
dial plan. Default setting: 3 seconds
The user presses the # key. • 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.