/// <summary>
/// Attempts to place a new outgoing call.
/// </summary>
/// <param name="sipCallDescriptor">A call descriptor containing the information about how
/// and where to place the call.</param>
/// <param name="mediaSession">The media session used for this call</param>
public async Task InitiateCall(SIPCallDescriptor sipCallDescriptor, IMediaSession mediaSession)
{
m_uac = new SIPClientUserAgent(m_transport);
m_uac.CallTrying += ClientCallTryingHandler;
m_uac.CallRinging += ClientCallRingingHandler;
m_uac.CallAnswered += ClientCallAnsweredHandler;
m_uac.CallFailed += ClientCallFailedHandler;
SIPEndPoint serverEndPoint = m_uac.GetCallDestination(sipCallDescriptor);
if (serverEndPoint != null)
{
MediaSession = mediaSession;
MediaSession.SessionMediaChanged += MediaSessionOnSessionMediaChanged;
var sdp = await MediaSession.CreateOffer(serverEndPoint.Address).ConfigureAwait(false);
sipCallDescriptor.Content = sdp;
m_uac.Call(sipCallDescriptor);
}
else
{
ClientCallFailed?.Invoke(m_uac, $"Could not resolve destination when placing call to {sipCallDescriptor.Uri}.");
CallEnded();
}
}
/// <summary>
/// Attempts to place a new outgoing call.
/// </summary>
/// <param name="sipCallDescriptor">A call descriptor containing the information about how
/// and where to place the call.</param>
/// <param name="mediaSession">The media session used for this call</param>
public async Task InitiateCallAsync(SIPCallDescriptor sipCallDescriptor, IMediaSession mediaSession)
{
m_cts = new CancellationTokenSource();
m_uac = new SIPClientUserAgent(m_transport);
m_uac.CallTrying += ClientCallTryingHandler;
m_uac.CallRinging += ClientCallRingingHandler;
m_uac.CallAnswered += ClientCallAnsweredHandler;
m_uac.CallFailed += ClientCallFailedHandler;
// Can be DNS lookups involved in getting the call destination.
SIPEndPoint serverEndPoint = await Task.Run <SIPEndPoint>(() => { return(m_uac.GetCallDestination(sipCallDescriptor)); }).ConfigureAwait(false);
if (serverEndPoint != null)
{
MediaSession = mediaSession;
MediaSession.OnRtpEvent += OnRemoteRtpEvent;
//MediaSession.OnRtpClosed += (reason) => Hangup();
MediaSession.OnRtpClosed += (reason) =>
{
if (!MediaSession.IsClosed)
{
logger.LogWarning($"RTP channel was closed with reason {reason}.");
}
};
RTCOfferOptions offerOptions = new RTCOfferOptions {
RemoteSignallingAddress = serverEndPoint.Address
};
var sdp = await mediaSession.createOffer(offerOptions).ConfigureAwait(false);
mediaSession.setLocalDescription(new RTCSessionDescription {
sdp = sdp, type = RTCSdpType.offer
});
if (mediaSession.localDescription == null)
{
ClientCallFailed?.Invoke(m_uac, $"Could not create a local SDP offer.");
CallEnded();
}
else
{
sipCallDescriptor.Content = mediaSession.localDescription.sdp.ToString();
// This initiates the call but does not wait for an answer.
m_uac.Call(sipCallDescriptor);
}
}
else
{
ClientCallFailed?.Invoke(m_uac, $"Could not resolve destination when placing call to {sipCallDescriptor.Uri}.");
CallEnded();
}
}
/// <summary>
/// Attempts to place a new outgoing call.
/// </summary>
/// <param name="sipCallDescriptor">A call descriptor containing the information about how
/// and where to place the call.</param>
/// <param name="mediaSession">The media session used for this call</param>
public async Task InitiateCallAsync(SIPCallDescriptor sipCallDescriptor, IMediaSession mediaSession)
{
m_cts = new CancellationTokenSource();
m_uac = new SIPClientUserAgent(m_transport);
m_uac.CallTrying += ClientCallTryingHandler;
m_uac.CallRinging += ClientCallRingingHandler;
m_uac.CallAnswered += ClientCallAnsweredHandler;
m_uac.CallFailed += ClientCallFailedHandler;
// Can be DNS lookups involved in getting the call destination.
SIPEndPoint serverEndPoint = await Task.Run <SIPEndPoint>(() => { return(m_uac.GetCallDestination(sipCallDescriptor)); }).ConfigureAwait(false);
if (serverEndPoint != null)
{
MediaSession = mediaSession;
MediaSession.OnRtpEvent += OnRemoteRtpEvent;
//MediaSession.OnRtpClosed += (reason) => Hangup();
MediaSession.OnRtpClosed += (reason) =>
{
if (!MediaSession.IsClosed)
{
logger.LogWarning($"RTP channel was closed with reason {reason}.");
}
};
var sdpAnnounceAddress = NetServices.GetLocalAddressForRemote(serverEndPoint.Address);
var sdp = mediaSession.CreateOffer(sdpAnnounceAddress);
if (sdp == null)
{
ClientCallFailed?.Invoke(m_uac, $"Could not generate an offer.", null);
CallEnded();
}
else
{
sipCallDescriptor.Content = sdp.ToString();
// This initiates the call but does not wait for an answer.
m_uac.Call(sipCallDescriptor);
}
}
else
{
ClientCallFailed?.Invoke(m_uac, $"Could not resolve destination when placing call to {sipCallDescriptor.Uri}.", null);
CallEnded();
}
}
/// <summary>
/// Event handler for a client call (one initiated by us) being answered.
/// </summary>
/// <param name="uac">The client user agent used to initiate the call.</param>
/// <param name="sipResponse">The INVITE success response.</param>
private async Task ClientCallAnsweredHandlerAsync(ISIPClientUserAgent uac, SIPResponse sipResponse)
{
if (sipResponse.StatusCode >= 200 && sipResponse.StatusCode <= 299)
{
// Only set the remote RTP end point if there hasn't already been a packet received on it.
await MediaSession.OfferAnswered(sipResponse.Body).ConfigureAwait(false);
Dialogue.DialogueState = SIPDialogueStateEnum.Confirmed;
logger.LogInformation($"Call attempt to {m_uac.CallDescriptor.Uri} was answered.");
ClientCallAnswered?.Invoke(uac, sipResponse);
}
else
{
logger.LogDebug($"Call attempt was answered with failure response {sipResponse.ShortDescription}.");
ClientCallFailed?.Invoke(uac, sipResponse.ReasonPhrase);
CallEnded();
}
}
/// <summary>
/// Event handler for a client call (one initiated by us) failing.
/// </summary>
/// <param name="uac">The client user agent used to initiate the call.</param>
/// <param name="errorMessage">An error message indicating the reason for the failure.</param>
private void ClientCallFailedHandler(ISIPClientUserAgent uac, string errorMessage)
{
logger.LogWarning($"Call attempt to {m_uac.CallDescriptor.Uri} failed with {errorMessage}.");
ClientCallFailed?.Invoke(uac, errorMessage);
}