Acceptance And Transmission Of The Dialed Digits - Cisco ATA 191 Administration Manual

Acceptance and Transmission of the Dialed Digits

Acceptance and Transmission of the Dialed Digits
When you dial 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, the set of candidates diminishes
until only one or none are valid. When a terminating event occurs, the ATA either accepts the dialed sequence
and initiates a call, or else rejects the sequence as invalid. You hear the reorder (fast busy) tone if the dialed
sequence is invalid.
The following table explains how terminating events are processed.
Table 88: Terminating Events
Terminating Event
The dialed digits do not match any
sequence in the dial plan.
The dialed digits exactly match one
sequence in the dial plan.
A timeout occurs.
You press the # key.
Dial Plan Timer (Off-Hook Timer)
You can think of the Dial Plan Timer as the "off-hook timer." This timer starts counting when the phone goes
off hook. If no digits are dialed within the specified number of seconds, the timer expires and the null entry
Cisco ATA 191 and ATA 192 Analog Telephone Adapter Administration Guide for Multiplatform Firmware
130
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.
Processing
The number is rejected.
• 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.
The number is rejected if the dialed digits don''t matched a digit sequence
in the dial plan within the time specified by the 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
• If the sequence is complete and permitted 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.
Advanced Options for Phone Services