Line information

A Line is composed by a list of calls, incoming subscriptions and outgoing subscriptions.

It also contains:

• SIP call publish information which is only used in the feature "DND presence state on no subscribers" (DDI Timeout Forwarding)

CId: call ID

State:  Idle, Publishing, Redirected, Unauthenticated, Published, Failed, Removing, Removed, Terminated, Underfined

•Variables information contains MWI information (Message Waiting Indicator)