Avaya SIP Software 3.2 for 1200 Series User Manual Page 127

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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 on page 127
Communication Server 1000 on page 128
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 Deskphones 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 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
Vertical 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
SIP Software for Avaya 1200 Series IP Deskphones-Administration January 2012 127
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