SIPSorcery.SIP.App.SIPClientUserAgent.GetCancelRequest C# (CSharp) Method

        private SIPRequest GetCancelRequest(SIPRequest inviteRequest)
        {
            SIPRequest cancelRequest = new SIPRequest(SIPMethodsEnum.CANCEL, inviteRequest.URI);
            cancelRequest.LocalSIPEndPoint = inviteRequest.LocalSIPEndPoint;

            SIPHeader inviteHeader = inviteRequest.Header;
            SIPHeader cancelHeader = new SIPHeader(inviteHeader.From, inviteHeader.To, inviteHeader.CSeq, inviteHeader.CallId);
            cancelRequest.Header = cancelHeader;
            cancelHeader.CSeqMethod = SIPMethodsEnum.CANCEL;
            cancelHeader.Routes = inviteHeader.Routes;
            cancelHeader.ProxySendFrom = inviteHeader.ProxySendFrom;
            cancelHeader.Vias = inviteHeader.Vias;

            return cancelRequest;
        }