.. _directory_numbers:

Directory Numbers Classification
--------------------------------

The Cisco HCS dial plan enables the creation of directory numbers (Cisco
Unified Communications Manager Internal DNs) with these choices of
characteristics:

Dial Plan Classification
........................


+---------------+----------+--------+-----+-------------+----------------+
|               | Site     | IDP    |     | Extension   |                |
| Dial Plan     | Location | (Inter | IDP | Dialing     | Extension      |
| Configuration | Code     | Site   | in  | Prefix      | Format         |
| Type          | (SLC)    | Prefix | DN  | (EDP)       |                |
|               |          | (ISP)) |     |             |                |
+===============+==========+========+=====+=============+================+
| 1             | Yes      | Yes    | No  | Unnecessary | SLC \+ Ext, No |
|               |          |        |     | with ISP    | ISP in SLC     |
+---------------+----------+--------+-----+-------------+----------------+
|               |          |        |     | Unnecessary | ISP\+SLC\+Ext  |
| 2             | Yes      | Yes    | Yes | with ISP    | (ISP is part   |
|               |          |        |     |             | of SLC)        |
+---------------+----------+--------+-----+-------------+----------------+
|               |          |        |     |             | SLC\+Ext and   |
| 3             | Yes      | No     | No  | Yes/No      | no ISP, can    |
|               |          |        |     |             | be with or     |
|               |          |        |     |             | without EDP    |
+---------------+----------+--------+-----+-------------+----------------+
|               |          |        |     | Not         | Ext (Flat      |
| 4             | No       | No     | No  | Applicable  | Dial Plan/ no  |
|               |          |        |     |             | SLC)           |
+---------------+----------+--------+-----+-------------+----------------+