Avaya 1040E User Manual

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 IP Deskphone, you must 
first initiate a new call by pressing the 

 context-sensitive soft key, 

select 

 and then dial the Vertical Service Code that 

is provided by your system administrator or service provider.

 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 IP Deskphone 
if required.

When multiple IP Deskphones 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 IP Deskphones to ring. Also, any user of 
the MADN SCA group can join a call initiated from any of the IP 
Deskphones 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.