Avaya NN43170-100 - Manual (Page 275)

Additional features
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Multiple Appearance Directory Number
Multiple Appearance Directory Number (MADN), also known as Bridge
Line Appearance, and using Single Call Appearance (SCA) allows
multiple phones to appear as a single line to the caller. Any of the IP
Deskphones with an active MADN feature can initiate or answer a call,
but only one call can be active at a time. However, other clients that are
part of the same MADN line can join the active call by going off hook.
You can prevent others from joining the call by using the MADN feature to
make the call private. To make the call private you dial a special code
(Vertical Service Code) so that the call server knows that the call is
private. To dial a Vertical Service Code on an Avaya 1165E IP
Deskphone, you must first initiate a new call by pressing the
Action
context-sensitive soft key, select New Call/Conference, and then dial the
Vertical Service Code that is provided by your system administrator or
service provider.
Note: The MADN feature is only available when you connect to a call
server that supports it. Your system administrator manages the
MADN feature and enables the MADN feature on your Avaya 1165E
IP Deskphone if required.
When multiple phones are configured with a MADN SCA feature, they
share one single Directory Number (DN) that is available to the user. An
incoming call to this DN or to any SIP address of the users of the MADN
SCA group causes all the phones to ring. Also, any user of the MADN
SCA group can join a call initiated from any of the phones of that group.
Any user that joins a call with the MADN SCA feature can put the call on
hold and prevent other users within the MADN SCA group from joining.