Establishes an outgoing call.

Namespace:  Microsoft.Rtc.Collaboration
Assembly:  Microsoft.Rtc.Collaboration(in Microsoft.Rtc.Collaboration.dll)

Syntax

Visual Basic (Declaration) 
Public 
Function 
BeginEstablish ( _
	
options 
As 

CallEstablishOptions, _
	
userCallback 
As 
AsyncCallback, _
	
state 
As 
Object _
) 
As 
IAsyncResult
C# 
public 
IAsyncResult 
BeginEstablish(
	

CallEstablishOptions 
options,
	
AsyncCallback 
userCallback,
	
Object 
state
)
Visual C++ 
public:
IAsyncResult^ 
BeginEstablish(
	

CallEstablishOptions^ 
options, 
	
AsyncCallback^ 
userCallback, 
	
Object^ 
state
)
JavaScript 
function 
beginEstablish(
options, 
userCallback, 
state);

Parameters

options
Type: Microsoft.Rtc.Collaboration . . :: . CallEstablishOptions
Optional parameters to establish the call.
userCallback
Type: AsyncCallback
The method to be called when the asynchronous operation is completed.
state
Type: Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.

Return Value

An IAsyncResult that references the asynchronous operation.

Exceptions

Exception Condition
ArgumentException Thrown when the optionsparameter contains invalid or restricted signaling headers. Also thrown when the call is used as a third party call controller with custom MIME parts or with early media support.
InvalidOperationException Thrown when the call is not in valid state to perform this operation or does not have valid media provider to bind to.

See Also