AudioVideoCall.BeginEstablishEarlyMedia Method (AsyncCallback, Object)
Sends a provisional reliable response with a 183 response code SessionProgress; also creates an early dialog.
Namespace: Microsoft.Rtc.Collaboration.AudioVideo
Assembly: Microsoft.Rtc.Collaboration (in Microsoft.Rtc.Collaboration.dll)
Syntax
'Declaration
Public Function BeginEstablishEarlyMedia ( _
userCallback As AsyncCallback, _
state As Object _
) As IAsyncResult
'Usage
Dim instance As AudioVideoCall
Dim userCallback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult
returnValue = instance.BeginEstablishEarlyMedia(userCallback, _
state)
public IAsyncResult BeginEstablishEarlyMedia(
AsyncCallback userCallback,
Object state
)
Parameters
- userCallback
Type: System.AsyncCallback
The method to be called when the asynchronous operation is completed.
- state
Type: System.Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.
Return Value
Type: System.IAsyncResult
An IAsyncResult that references the asynchronous operation.
Exceptions
| Exception | Condition |
|---|---|
| InvalidOperationException | Thrown when the call is not in the incoming state, the remote side does not support reliable provisional response or when early media is already being negotiated. |