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

        public SIPResponse GetOkResponse(SIPRequest sipRequest, SIPEndPoint localSIPEndPoint, string contentType, string messageBody)
        {
            try
            {
                SIPResponse okResponse = new SIPResponse(SIPResponseStatusCodesEnum.Ok, null, sipRequest.LocalSIPEndPoint);

                SIPHeader requestHeader = sipRequest.Header;
                okResponse.Header = new SIPHeader(new SIPContactHeader(null, new SIPURI(sipRequest.URI.Scheme, localSIPEndPoint)), requestHeader.From, requestHeader.To, requestHeader.CSeq, requestHeader.CallId);

                if (m_contactIPAddress != null)
                {
                    IPEndPoint contactEP = IPSocket.GetIPEndPoint(okResponse.Header.Contact.First().ContactURI.Host);
                    contactEP.Address = m_contactIPAddress;
                    okResponse.Header.Contact.First().ContactURI.Host = contactEP.ToString();
                }

                okResponse.Header.To.ToTag = m_localTag;
                okResponse.Header.CSeqMethod = requestHeader.CSeqMethod;
                okResponse.Header.Vias = requestHeader.Vias;
                okResponse.Header.Server = m_sipServerAgent;
                okResponse.Header.MaxForwards = Int32.MinValue;
                okResponse.Header.RecordRoutes = requestHeader.RecordRoutes;
                okResponse.Body = messageBody;
                okResponse.Header.ContentType = contentType;
                okResponse.Header.ContentLength = (messageBody != null) ? messageBody.Length : 0;

                return okResponse;
            }
            catch (Exception excp)
            {
                logger.Error("Exception GetOkResponse. " + excp.Message);
                throw excp;
            }
        }