What is the best practice of configuring an intercom on a shared line?
A.
This feature allows all endpoints to participate in intercom messages.
B.
This feature can be used only when the intercomephone-dn is configured as a dual line
C.
This feature is not supported and should not be used
D.
This feature can be supported only in a unidirectional manner.
E.
This feature allows one endpoint to contact multiple endpoints simultaneously