Detailed description of Uniform Dial Plan

Last Updated : Oct 30, 2012 |
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The software uses the UDP to route a call off the local server. The user dials an extension that consists of 3 to 18 digits. The software converts the extension that the user dials into a private-network number or a public network number.
To convert the extension, the software substitutes digits at the front of the extension that the user dials. The software supports the following types of extension conversions:
  • Automatic Alternate Routing (AAR)
    The system uses AAR routing information to route calls within your company over your own private network.
    The software converts the number that the user dials. The software then analyzes the number, and routes the call as a private-network call.
  • Automatic Route Selection (ARS)
    The system uses ARS routing information to route calls that go outside your company over public networks. The system also uses ARS routing information to route calls to remote company locations if you do not have a private network.
    The software converts the number that the user dials. The software then analyzes the number, and routes the call as a public network call.
  • Extension number portability (ENP)
    If you want calls on your system to use ENP conversion, you must specify a node number. The software uses the node number to determine the routing pattern for the call. If the user dials an extension that consists of 4 to 6 digits, the software chooses an ENP code that is based on the first 1 or 2 digits of the extension. The software does not use the ENP code for routing. Therefore the ENP code is independent of location.
  • Extension (EXT)
    The system uses EXT conversion to analyze the extension that the user dials.
    Unlike AAR conversion or ARS conversion, the system might not change the extension that the user dials, before the system routes the call. If no UDP entry for a particular extension or for a range of extensions exists, the system considers the extensions to be local extensions.
You specify a UDP for individual extensions or groups of extensions that have the same leading digits. For example, if you use a 5-digit UDP, and choose a matching pattern of 123, all 5-digit extensions that begin with 123 have the same UDP conversion scheme. If you use a 5-digit UDP, and want the software to use the UDP for only one extension, you must create a matching pattern that is the same as the extension. For example, if you choose a 5-digit UDP for extension 12345, you must specify 12345 as the matching pattern.
Each user extension can be assigned to one of the following six treatments:
  • UDP Code
    • Conversion to AAR with a given location code
    • Further conversion is suppressed
  • AAR Code
    • Conversion to AAR with a given location code
    • Further conversion is suppressed
  • ENP Code
    • Conversion to a private-network number
    • Route to the given node number routing
  • Temp OOS
    • Temporarily out of service
    • Give reorder
  • Local
    Local range of extensions
  • Blank
    This treatment is similar to local, but the system bypasses the when you perform an add station command.
When a user dials an extension that is on a server that is included in a UDP, the software firsts determines if the extension is assigned to a local station on the server. If the extension is assigned to a local station on the server, the software routes the call to the station. The software does not convert the extension numbers.
When a user dials an extension that is not on the server, the software compares the extension with the matching patterns. If the software finds a match between the extension and the matching patterns, the software converts the extension into a private network number. The software then routes the call as specified by the conversion.
When a user dials an extension, and the extension matches more than one matching pattern, the software selects the pattern that has the most matching digits. The software compares the extension and the matching pattern starting with the first digits that the user dials through to the last digits. See the table, for examples of matching patterns.
If the extension does not match a matching pattern, and Extended Trunk Access (ETA) is enabled on the system, the software uses ETA to route the call. If the extension does not match a matching pattern, and ETA is disabled on the system, the user receives intercept treatment.
Matching pattern selections
Extension dialed
Matching patterns available
Matching pattern selected
123
123 and 1234
123
12345
123 and 1234
1234
12355
123 and 1234
123
Related links
Uniform Dial Plan example