Technical data

2-1
Chapter 2: Directory Number (DN)
MBX IP Description / Operations & Programming Guide
Chapter 2
Directory Number (DN)
Directory Number (DN) is the telephone number for internal users, which can be used
exclusively by only one station or can be shared by multiple stations.
The basic idea of providing the DN feature is not only to assign one telephone number to one
physical telephone, but also to allow one telephone number to be shared and used by multiple
physical stations.
So, if one DN is contained by a variety of multi-functional terminals or analog telephones, all
those physical stations can be assumed as one logical station as if several analog telephone
sets can be connected to one physical line.
In another way, one physical telephone can have multiple DNs allowing for additional outgoing
and incoming calls.
Terms
TYPES OF DN
• SADN-NORMAL : Single-Assign Directory Number (SADN) that can be used by only one station.
• SADN-HOTDESK : Single-Assign Directory Number (SADN) for Hot Desk Usage.
• MADN: Multi-Assign Directory Number (MADN) that can be used by one or multiple stations.
CATEGORY OF DN
• My-DN (M-DN): each station must have at least one unique number that cannot be used by another
station (minimum requirement, automatically assigned by board configuration). Otherwise, it is not
possible to make outgoing calls or receive incoming calls.
• Sub-DN (S-DN): station can have more numbers but M-DN. All numbers except M-DN are called
S-DN.
NOTE: S-DN can be shared by other stations if it is MADN type.
PRIME DN
• If multiple numbers are used by a station, one DN can be selected to have higher priority over
others. When only one number exists, it becomes P-DN, which will be seized first for outgoing calls,
answered first if there's are multiple incoming calls, and used for idle status display for DND,
Forward, Absent Message and so on that can be set independently for each DN.
Release 1.0
November 2010