/// <summary>
/// Requests the SIP device to send a video key frame.
/// </summary>
/// <param name="rtpSession"></param>
private static void RequestSIPAgentKeyFrame(RTPSession rtpSession)
{
if (rtpSession != null && !rtpSession.IsClosed)
{
var localVideoSsrc = rtpSession.VideoLocalTrack.Ssrc;
var remoteVideoSsrc = rtpSession.VideoRemoteTrack.Ssrc;
Console.WriteLine($"Requesting key frame from SIP connection for remote ssrc {remoteVideoSsrc}.");
RTCPFeedback pli = new RTCPFeedback(localVideoSsrc, remoteVideoSsrc, PSFBFeedbackTypesEnum.PLI);
rtpSession.SendRtcpFeedback(SDPMediaTypesEnum.video, pli);
}
}