SIPSorcery.SIP.UASInviteTransaction.CancelCall C# (CSharp) Method

        public void CancelCall()
        {
            try
            {
                if (TransactionState == SIPTransactionStatesEnum.Calling || TransactionState == SIPTransactionStatesEnum.Trying || TransactionState == SIPTransactionStatesEnum.Proceeding)
                {
                    base.Cancel();

                    SIPResponse cancelResponse = SIPTransport.GetResponse(TransactionRequest, SIPResponseStatusCodesEnum.RequestTerminated, null);
                    SendFinalResponse(cancelResponse);

                    if (UASInviteTransactionCancelled != null)
                    {
                        UASInviteTransactionCancelled(this);
                    }
                }
                else
                {
                    logger.Warn("A request was made to cancel transaction " + TransactionId + " that was not in the calling, trying or proceeding states, state=" + TransactionState + ".");
                }

                //if (CDR != null) {
                //    CDR.Cancelled();
                //}
            }
            catch (Exception excp)
            {
                logger.Error("Exception UASInviteTransaction CancelCall. " + excp.Message);
                throw;
            }
        }

        private void SIPCancelTransaction_TransactionRequestReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPRequest sipRequest)
        {
            try
            {
                //logger.LogDebug("CANCEL request received, attempting to locate and cancel transaction.");

                //UASInviteTransaction originalTransaction = (UASInviteTransaction)GetTransaction(GetRequestTransactionId(sipRequest.Header.Via.TopViaHeader.Branch, SIPMethodsEnum.INVITE));

                SIPResponse cancelResponse;

                if (m_originalTransaction != null)
                {
                    //logger.LogDebug("Transaction found to cancel " + originalTransaction.TransactionId + " type " + originalTransaction.TransactionType + ".");
                    m_originalTransaction.CancelCall();
                    cancelResponse = GetCancelResponse(sipRequest, SIPResponseStatusCodesEnum.Ok);
                }
                else
                {
                    cancelResponse = GetCancelResponse(sipRequest, SIPResponseStatusCodesEnum.CallLegTransactionDoesNotExist);
                }

                //UpdateTransactionState(SIPTransactionStatesEnum.Completed);
                SendFinalResponse(cancelResponse);
            }
            catch (Exception excp)
            {
                logger.LogError("Exception SIPCancelTransaction GotRequest. " + excp.Message);
            }
        }