Altigen AltiWare OE 4.0, Administration Manual

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Setting a System Number Plan
AltiWare OE System Administration Manual 25
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Use the Number Plan window to specify the following:
• Extension Length. The number of digits for your extension
numbering system. Valid entries are from 3 – 6. For example,
extension 2001 and 4020 are 4-digit extension numbers.
The extension length is not adjustable once the first extension is
configured. To be more precise, the length cannot be changed
without totally reconfiguring the system or deleting all the
extensions already configured.
• DID Number Length. The number of digits needed to match a DID
(Direct Inward Dialing) number, with a range from 2 – 16.
Each extension can be assigned a DID number. A DID number does
not have a fixed length. For example, the DID number length is 4; the
extension DID number - 2529299.
Depending on the service contract with the Central Office (CO), the
DID trunk can send all 7 digits (2529299) or just the last 4 digits
(9299). If this DID Number Length option is set to 4, the system
always tries to match the last 4 digits received to the last 4 digits of a
DID number, regardless of what is received.
To accommodate future growth and minimize disturbance, it is
recommended that the length of the DID numbers assigned to
an extension be greater than or equal to this DID Number
Length. However, it is not necessary to use the DID Number length when
routing via Tie Trunks.
• First Digit Assignments. These define how the system responds to the
first digit dialed by the user. If a particular digit is grayed out—not
available—that means it cannot be used in the country location
selected in the General window.
The drop-down list options for each digit are as follows:
— Extension
— Trunk Access
— Feature Access
— Operator
— Invalid (no action)
— IP Trunk Access
— Route Access