SIPSorcery.SIP.SIPTransaction.GetRequestTransactionId C# (CSharp) Method

        public static string GetRequestTransactionId(string branchId, SIPMethodsEnum method)
        {
            return Crypto.GetSHAHashAsString(branchId + method.ToString());
        }

        public SIPTransaction GetTransaction(SIPResponse sipResponse)
        {
            if (sipResponse.Header.Vias.TopViaHeader.Branch == null || sipResponse.Header.Vias.TopViaHeader.Branch.Trim().Length == 0)
            {
                return(null);
            }
            else
            {
                string transactionId = SIPTransaction.GetRequestTransactionId(sipResponse.Header.Vias.TopViaHeader.Branch, sipResponse.Header.CSeqMethod);

                m_pendingTransactions.TryGetValue(transactionId, out var transaction);
                return(transaction);
            }
        }