Numbering Plan Configuration

The Numbering Plan defines the actual numbers to be dialed by system users to access the different services of the UCX system. As an example, the telephone extensions could start at 200 and end at 249, DID numbers could be assigned as 3000 through 3049. Many of the UCX system's services use feature access codes that are predefined. For example voice mail can be accessed by dialing the feature codes *97 or *98. Careful consideration needs to be given when creating a numbering plan to avoid numbering plan conflicts between the various services and features.

Extension Numbers

Extensions typically start with the number 2-8 and can be two, three, four or more digits in length. You will have to define extensions for some or all of the following devices and features:

  • Telephone sets
  • Ring groups (groups of telephone sets that can be used as a destination for incoming calls)
  • Page groups (groups of telephone sets that can be paged together)
  • Parking lot (a range of extensions available for parking of calls)

Telephone extensions require one license for each extension programmed in the system. Extension numbers for features such as ring groups, page groups, virtual extensions, conference bridges or parking lot do not require licenses.

Inbound Routes

The UCX system is extremely flexible when it comes time to terminate an inbound call. Calls can be terminated based on the DID or Call ID information transmitted to the system from the central office that is providing the Inbound Route service. There are several services that can be used to terminate an inbound call, such as Time of Day controls, Day/Night Controls, Ring Groups, IVR menus, Contact Center Queues and others.

Outbound Routes

Historically outbound routes have been accessed by dialing an access code (typically 9) followed by the number to be called. The UCX system allows an access code to be dialed followed by the number to be called. Alternatively, outbound routes can be accessed just by dialing the number.
If for example the digit 1 is required to dial a telephone number as long distance, a route can be setup to require the user to dial the 1. The UCX system can also make calling out simpler for the user by inserting the 1 into the dialing string on those calls that require long distance service. Also, PIN codes can be used to limit access to outbound routes.

Feature Codes

There are over 50 features that are available to users of the UCX system. These features are accessed via feature codes. The vast majority of these feature codes begins with an asterisk (*) followed by a string of digits. Feature access codes can be modified to fit into your custom numbering plan. For details on how to configure feature access codes and how to use these features please refer to the appropriate section of this manual.

The following table provides a list of numbering plan related parameters that you should prepare:


Selected Value

Extension number length


Telephone extension numbers - range

________ - ________

Ring group extension numbers - range

________ - ________

Page group extension numbers - range

________ - ________

Parking lot - extension / number of slots

________ / ________

Inbound route DID's - range

________________ - ________________

Outbound route access code(s)


Numbering Plan Overview

There is a Numbering Plan page provided under the PBX Configuration tab that gives the administrator an overall view of the dialable numbers configured in the system. This is a useful planning tool for the administrator. For details please see Numbering Plan.