SIPSorcery.Net.STUNServer.GetResponse C# (CSharp) Method

        private STUNMessage GetResponse(IPEndPoint receivedEndPoint, STUNMessage stunRequest, bool primary)
        {
            if (stunRequest.Header.MessageType == STUNMessageTypesEnum.BindingRequest)
            {
                STUNMessage stunResponse = new STUNMessage();
                stunResponse.Header.MessageType = STUNMessageTypesEnum.BindingResponse;
                stunResponse.Header.TransactionId = stunRequest.Header.TransactionId;

                // Add MappedAddress attribute to indicate the socket the request was received from.
                STUNAddressAttribute mappedAddressAtt = new STUNAddressAttribute(STUNAttributeTypesEnum.MappedAddress, receivedEndPoint.Port, receivedEndPoint.Address);
                stunResponse.Attributes.Add(mappedAddressAtt);

                // Add SourceAddress attribute to indicate the socket used to send the response.
                if (primary)
                {
                    STUNAddressAttribute sourceAddressAtt = new STUNAddressAttribute(STUNAttributeTypesEnum.SourceAddress, m_primaryEndPoint.Port, m_primaryEndPoint.Address);
                    stunResponse.Attributes.Add(sourceAddressAtt);
                }
                else
                {
                    STUNAddressAttribute sourceAddressAtt = new STUNAddressAttribute(STUNAttributeTypesEnum.SourceAddress, m_secondaryEndPoint.Port, m_secondaryEndPoint.Address);
                    stunResponse.Attributes.Add(sourceAddressAtt);
                }

                // Add ChangedAddress attribute to inidcate the servers alternative socket.
                if (primary)
                {
                    STUNAddressAttribute changedAddressAtt = new STUNAddressAttribute(STUNAttributeTypesEnum.ChangedAddress, m_secondaryEndPoint.Port, m_secondaryEndPoint.Address);
                    stunResponse.Attributes.Add(changedAddressAtt);
                }
                else
                {
                    STUNAddressAttribute changedAddressAtt = new STUNAddressAttribute(STUNAttributeTypesEnum.ChangedAddress, m_primaryEndPoint.Port, m_primaryEndPoint.Address);
                    stunResponse.Attributes.Add(changedAddressAtt);
                }

                //Console.WriteLine(stunResponse.ToString());

                //byte[] stunResponseBuffer = stunResponse.ToByteBuffer();

                return stunResponse;
            }

            return null;
        }