/// <summary>
/// Answers the call request contained in the user agent server parameter. Note the
/// <see cref="AcceptCall(SIPRequest)"/> method should be used to create the user agent server.
/// Any existing call will be hungup.
/// </summary>
/// <param name="uas">The user agent server holding the pending call to answer.</param>
/// <param name="mediaSession">The media session used for this call</param>
public async Task Answer(SIPServerUserAgent uas, IMediaSession mediaSession)
{
// This call is now taking over any existing call.
if (IsCallActive)
{
Hangup();
}
var sipRequest = uas.ClientTransaction.TransactionRequest;
MediaSession = mediaSession;
MediaSession.SessionMediaChanged += MediaSessionOnSessionMediaChanged;
MediaSession.OnRtpClosed += (reason) => Hangup();
var sdpAnswer = await MediaSession.AnswerOffer(sipRequest.Body).ConfigureAwait(false);
m_uas = uas;
m_uas.Answer(m_sdpContentType, sdpAnswer, null, SIPDialogueTransferModesEnum.Default);
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
}