BeginSendReliableProvisionalResponse Method (Int32, IEnumerable(SignalingHeader), Boolean, AsyncCallback, Object)

Sends a reliable provisional response with option to send answer for early media.

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


Public Function BeginSendReliableProvisionalResponse ( _
    responseCode As Integer, _
    signalingHeaders As IEnumerable(Of SignalingHeader), _
    needEarlyMediaSupport As Boolean, _
    userCallback As AsyncCallback, _
    state As Object _
) As IAsyncResult
Dim instance As SignalingSession
Dim responseCode As Integer
Dim signalingHeaders As IEnumerable(Of SignalingHeader)
Dim needEarlyMediaSupport As Boolean
Dim userCallback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginSendReliableProvisionalResponse(responseCode, _
    signalingHeaders, needEarlyMediaSupport, _
    userCallback, state)
public IAsyncResult BeginSendReliableProvisionalResponse(
    int responseCode,
    IEnumerable<SignalingHeader> signalingHeaders,
    bool needEarlyMediaSupport,
    AsyncCallback userCallback,
    Object state


  • responseCode
    Type: System..::..Int32
    The provisonal response code in the range 101-199.
  • needEarlyMediaSupport
    Type: System..::..Boolean
    The flag indicating whether the provisional response needs to send the media description.
  • userCallback
    Type: System..::..AsyncCallback
    The callback to be invoked when the SendProvisionalResponse operation has completed.

Return Value

Type: System..::..IAsyncResult
An IAsyncResult object that references this operation.


Exception Condition

Thrown when the response code is not a provisional response code.


Thrown if the sesison is not in incoming state.


If the inviter supports 100rel and the local policy is not unsupported, this method will wait for the PRACK. Otherwise, this method will not require 100rel. Any application that supports 100rel is recommended to use this method for sending provisional response. SendProvisional method can be used only when the application knows for sure that the remote does not require 100rel.

See Also


SignalingSession Class

SignalingSession Members

BeginSendReliableProvisionalResponse Overload

Microsoft.Rtc.Signaling Namespace