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Using Phone Features Multiple Appearance Directory Number (MDN)
26 IP Phone 1120 User Guide
Multiple Appearance Directory Number (MDN)
Multiple Appearance Directory Number (MDN) is a feature that allows one phone number to
appear on more than one IP Phone. In each MDN group, one number is designated as the
primary, and one or more other users are designated as secondary group members. When a
call is made to the primary number, the call rings on the primary phone and flashes and rings
(unless set to non-ringing) on each secondary group member’s phone. If you are a secondary
group member, you can then answer the call or place the call on hold. You can also make
outbound calls using an MDN key.
MDN is available in two forms: Multiple Call Appearance (MDN MCA) and Single Call
Appearance (MDN SCA):
• MDN SCA keys display the status (on-hook, off-hook) of the MDN SCA primary line;
MDN MCA keys do not.
• When a MDN SCA line is off-hook , no one else can make or receive calls on that line.
When you use a MDN MCA line, others can still use that line, up to the number of
available MDN MCA lines assigned to the MDN MCA group.
A common application of this is to provide a way for an administrator to monitor and manage
phone calls to their manager, or for a receptionist to manage calls to employees. In this
situation, the manager or employee is designated as the primary MDN member, and the
administrator or receptionist is designated as the secondary group member and is provided
with an MDN key for each manager/employee.
Another application for this feature is to form a simple call group, in which a call to a
selected number (primary) can be answered by others designated as secondary group
members.
Making a Call on an MDN MCA or MDN SCA Key
Steps to Take
1. Press the MDN MCA or MDN SCA key.
2. Dial the number that you want to call.
Answering an MDN MCA or MDN SCA Call
• When the MDN MCA or SCA key flashes and (if provisioned to ring) your phone rings,
press the MDN MCA or MDN SCA key. If more than one line is ringing in the MDN
group, you will answer the first incoming call.
Transferring a MDN SCA Call to Another MDN SCA Group Member
While you are on a call on the MDN SCA line:
1. Place the MDN SCA call on hold by pressing the Hold key.
2. Any available member of your MDN SCA group can now obtain the call by pressing
their MDN SCA key.