# Editing DDI numbers

Lets you edit the DDI numbers for ISDN or SIP connections and link them with call distribution elements.

Table 1. Settings
Parameter | Explanation
DDI plan | Lets you select the DDI plan for which you want to create a new DDI number.
Direct dialling number | Enter here the DDI number you want to create.
Routing destination | A call distribution element (CDE) is defined as standard as the destination for a DDI. If a fax server is in operation on the applications card of a CPU2, Routing destination = FAX must be configured for the fax numbers. Note: The Routing destination parameter is visible only for a Mitel 470 fitted with CPU2 application card.
Call distribution element | Select here the reference number of the call distribution element to be created together with the DDI number. The first available call distribution element is used as the default setting.
Dynamic DDI allocation (hospitality) | This DDI number can be used in the hospitality business for dynamic DDI allocation. Requirement: DDI destination after check-out must be defined. Note: The call destination for switch position 1 is automatically set to User . This DDI number is not available for dynamic DDI allocation.

## Direct Dialling Plans

In a DDI plan you enter all the DDI numbers you set up or subscribed to with a provider. If you access the network via more than one provider (e.g. a PSTN provider and an SIP provider), set up a separate DDI plan for each provider.

## Dialling in number

Direct dialling is used to reach internal users directly from the public network. The incoming call is linked with an internal destination (or several internal destinations) on the basis of the call number’s direct dial portion.

Within a direct dialling plan create your number ranges by agreement with the public network operator; these number ranges match the anticipated direct dial portions of the call numbers. In a three-digit direct dialling plan, for example, number ranges of 300…399 and 500…549 are created.

Table 2. Example of a dialling-in number
DDI | Call number
Trunk connection’s main number | +41 32 624 1300
User’s phone number | +41 32 624 1344
Direct dial portion | 44
Dialling-in number entries in unspecified format (Unknown) | 44, 1344, 6241344, 0326241344 (examples)
Dialling-in number entry in national format (National) | 326241344
Dialling-in number entry in international format (International) | 4132 6241344

Use National or International and the corresponding dialling-in numbers if you have activated Special Arrangement (CLIP not screening) with your network provider.

notes:

- The outgoing CLIP number and the outgoing CLIP format in the trunk group configuration must match the dialling-in number and the dialling-in number format.
- The CLIP specified manually in the user configuration must match the dialling-in number if the Unknown CLIP format is used.
- If you entered the CLIP number manually in the user configuration and use the Unknown CLIP format, the CLIP number entered must match the dialling-in number.

## Call distribution element

The call distribution elements are responsible for routing calls to one or several destinations. When you create a DDI number, a new call distribution element is also automatically created and linked.

You have the possibility of altering the automatic allocation. You can link several DDI numbers to the same call distribution element. You can delete any non-allocated call distribution elements at the end of the DDI configuration.

The call distribution elements are not available in standard mode. They are created, linked and configured automatically in the background. That is why you specify the internal destinations when configuring the DDI.

Note:

In USA/Canada the abbreviation DID (Direct Inward Dial) is used instead of DDI (Direct Dialling In)

Parent topic: Incoming call routing
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