Additional features
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 Action
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 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.