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#

Dial Plan Configuration Type

Site Location Code (SLC)

IDP (Inter Site Prefix (ISP))

IDP in DN

Extension Dialing Prefix (EDP)

Extension Format

1

Yes

Yes

No

Unnecessary with ISP

SLC + Ext, No ISP in SLC

2

Yes

Yes

Yes

Unnecessary with ISP

ISP+SLC+Ext (ISP is part of SLC)

3

Yes

No

No

Yes/No

SLC+Ext and no ISP, can be with or without EDP

4

No

No

No

Not Applicable

Ext (Flat Dial Plan/ no SLC)