
Chapter 12: Multiple Appearance Directory
Number (Single Call
Arrangement)
The Multiple
Appearance Directory Number (MADN) (Single Call Arrangement) feature operates
differently depending on the type of Communication Server. For instance, the MADN feature operates
differently on the Communication Server 2000 than the Communication Server 1000. For more information
about the MADN feature and how it operates on the communication servers, see the following sections:
Communication Server 2000 and Communication Server
2100
The MADN feature allows a Directory Number (DN) to appear on more than one IP
Deskphone
with SIP Software. The MADN with Single Call Arrangement (SCA) feature allows multiple IP
Deskphones to appear as a single line to a caller. Any one of the IP Deskphone phones in a
group with MADN can initiate or answer a call, but only one call can be active at any given
time. Any other user in the group can join the active call by picking up the handset of the IP
Deskphone with SIP Software.
With the MADN SCA feature configured on multiple phones of different registered SIP users,
the phones share one single DN. An incoming call to this DN causes all the phones in the group
to ring.
Any user of an IP Deskphone with the MADN SCA feature can put a call on hold or can prevent
others from joining in the active call.
If a user’s group is active (as seen by line icon being off-hook) and the user picks up the
handset, the user is automatically joined to an ongoing MADN call (unless the server restricts
this feature for privacy or other factors).
Vertical services
V
ertical services are CS 2000 and CS 2100 features that can be activated or deactivated by
dialing a defined code, for example, Privacy. Even though no more than one active session
can be established for the MADN SCA group, members of the group can still enter certain
vertical services.
Currently, the available vertical service is Privacy.
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