Nortel Networks Meridian M3905 - Manual (Page 16)

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Directory Numbers
Private Line — A Private Line can be assigned to your telephone. With this line
you can reach an outside number without dialing a code to access an outside line.
Internal extensions cannot be dialed from a private line.
Ringback/ring tone
— The Ringback/ring tone is the sound you hear when a call
you have made is ringing at its destination.
Shared Directory Numbers
— A shared directory number is a DN (extension)
that is shared by two or more telephones. This is also known as a Multiple
Appearance DN (MADN).
Special dial tone
— The special dial tone refers to three consecutive tones followed
by dial tone that you hear when accessing some of your telephone features.
Switchhook
— The switchhook is the button the optional handset presses down,
disconnecting your call, when you replace the handset. When you lift the handset
on the M3905 you must press an Individual Line (DN) Key to receive dial tone.
Directory Numbers
Primary Directory Number
The lower right Programmable Line (DN)/Feature Key is the ACD Primary
Directory
Number ( DN) Key. The function of this key is identical to that of the
In-Calls Key.
Individual Directory Number
The Individual Directory Number (DN) is a secondary DN for the telephone. You
can make outgoing calls on this number and receive incoming calls. The
Individual line can be configured to have all the standard functions of a regular,
non-ACD, telephone line.
Note:
You have only one Primary Directory Number assigned to your telephone.
You can have multiple Individual DNs assigned to your telephone.