public void pull(string ip, int port)
        {
             ....
             ....

            // 2. CreatePullPointSubscription
            FilterType filter = new FilterType();
            DateTime currentTime;
            XmlElement[] xml = null;
            DateTime? termTime;
            List<MessageHeader> lstHeaders = new List<MessageHeader>() { };

            EndpointReferenceType ert = eptc.CreatePullPointSubscription(
                filter,
                "PT15S",
                new CreatePullPointSubscriptionSubscriptionPolicy(),
                ref xml,
                out currentTime,
                out termTime
                );
            listBox1.Items.Add(ert.Address.Value);

            //PROBLEM HERE "ReferenceParameters" IS NULL
            if ((ert.ReferenceParameters != null) && (ert.ReferenceParameters.Any != null))
            {
                foreach (System.Xml.XmlElement oXml in ert.ReferenceParameters.Any)
                {
                    string strName = oXml.LocalName;
                    string strNS = oXml.NamespaceURI;
                    string strValue = oXml.InnerXml;

                    lstHeaders.Add(MessageHeader.CreateHeader(strName, strNS, strValue, true));
                }
            }