Specifications
Dialing Plan
Planning and Installation Guide 6 – 9
Define Digit Manipulation
Once the route decision has been made, the call is passed to the trunk. The dialed
number, which is normally passed within the system in canonical format, is examined
and manipulated based on the trunk group configuration. This ensures that the
number can be properly received by the service provider.
First, the trunk access code dialed by the user is removed. If the number is in canonical
format (local, long distance, ERC, international), digit manipulation can occur. If the
number is unroutable (n11, ECS, operator, and vertical service code numbers) digit
manipulation (other than the dial-out prefix) is not applied.
Figure 6-6 Digit Manipulation on the Trunk Group Edit Page
To specify trunk digit manipulation:
Step 1 Open the Trunk Digit Manipulation page, shown in Figure 6-6.
Step 2 Select the options and specify numbers as needed, using Table 6-1 as a
guide.
Table 6-1 Digit Manipulation Options
Option Description Example
Remove leading 1 from 1+10D This option is required by some long-distance
service providers that only accept numbers
dialed as 10 digits.
AT&T typically only supports
10-digit dialing.
Remove leading 1 for Local Area
Codes
This option is required by some local service
providers with multiple local area codes. The
Local Area Codes include both the Local Area
Code and Additional Local Area Codes
configured against the trunk group.
Atlanta has three local area codes
that must be dialed as 10 digits.
Note This could also be called
“Dial 10 digits for Local Area
Codes.”
Remove leading 1 for Local Area
Codes (except for prefix exceptions
listed below)
This option is required by a few local service
providers that have mixed 10-digit and 1+10 digit
dialing in the same area code. Local Area Codes
include both the Local Area Code and
Additional Local Area Codes configured against
the trunk group.
Dial 7 digits for Local Area Code This option is required by some local service
providers that only accept numbers dialed as 7
digits for the single, local area code.
Napa, California.
Dial 7 digits for Local Area Code
(except for the prefix exceptions
listed below)
This option is required by a few local service
providers that have mixed 10-digit and 1+10 digit
dialing in the same area code.
Massachusetts and Maine.