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Call Sub-session Tutorial

Lines can have zero or more active calls. The call functionality includes dialling a number, to waiting for incoming calls, and to hanging up. A client can get status and capabilities information, and can be notified of changes.

The call interface is provided by the RCall class.

This section describes the Call sub-session functions and how to use them.

Function	Description
`Open()`	Call this function to open a line sub-session in a phone. Similarly a line sub-session can be created in a server. The server is used when the phone functionality for a line is not required.
`GetCaps()`	Call this function to get the line capabilities.
`NotifyCapsChange()`	Call this function to receive notification there are changes in a line. To cancel a request, call the `NotifyCapsChangesCancel()` function.
`GetStatus()`	Call this function to get the line status.
`GetHookStatus()`	Call this function to get the status of a hook associated with the line.
`EnumerateCall()`	Call this function to get the number of calls opened in a line.
`GetCallInfo()`	Call this function to get a detailed information about a call in a line sub-session.
`GetInfo()`	Call this function to get the information about the current line.
`NotifyIncomingCall()`	Call this function to get notification of incoming calls. To cancel an earlier request for the incoming call notification, call the `NotifyIncomingCallCancel()`.
`NotifyHookChange()`	Call this function to get the notification of hook status changes.
`NotifyStatusChange()`	Call this function to get the notification about the status changes of a line.
`NotifyCallAdded()`	To get the information about the new calls added to a line. Call the `NotifyCallAddedCancel()` function to cancel an earlier request.

Parent topic: Core Telephony