/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.IO;
using System.Net;
using System.Web;
using System.Text;
using System.Xml;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using OpenMetaverse;
using log4net;
using Nini.Config;
using Nwc.XmlRpc;
using OpenSim.Framework;
using OpenSim.Framework.Communications.Cache;
using OpenSim.Framework.Communications.Capabilities;
using OpenSim.Framework.Servers;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using Caps = OpenSim.Framework.Communications.Capabilities.Caps;
using System.Text.RegularExpressions;

namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
{
    public class FreeSwitchVoiceModule : IRegionModule
    {

        // Infrastructure
        private static readonly ILog m_log =
            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        // Capability string prefixes
        private static readonly string m_parcelVoiceInfoRequestPath = "0007/";
        private static readonly string m_provisionVoiceAccountRequestPath = "0008/";
        private static readonly string m_chatSessionRequestPath = "0009/";

        // Control info
        private static bool   m_WOF = true;
        private static bool   m_pluginEnabled  = false;

        // FreeSwitch server is going to contact us and ask us all
        // sorts of things.
        private static string m_freeSwitchServerUser;
        private static string m_freeSwitchServerPass;

        // SLVoice client will do a GET on this prefix
        private static string m_freeSwitchAPIPrefix;

        // We need to return some information to SLVoice 
        // figured those out via curl
        // http://vd1.vivox.com/api2/viv_get_prelogin.php
        //
        // need to figure out whether we do need to return ALL of
        // these...
        private static string m_freeSwitchRealm;
        private static string m_freeSwitchSIPProxy;
        private static bool m_freeSwitchAttemptUseSTUN;
        private static string m_freeSwitchSTUNServer;
        private static string m_freeSwitchEchoServer;
        private static int m_freeSwitchEchoPort;
        private static string m_freeSwitchDefaultWellKnownIP;
        private static int m_freeSwitchDefaultTimeout;
        // private static int m_freeSwitchSubscribeRetry;
        private static string m_freeSwitchUrlResetPassword;
        // private static IPEndPoint m_FreeSwitchServiceIP;
        private int m_freeSwitchServicePort;
        private string m_openSimWellKnownHTTPAddress;

        private FreeSwitchDirectory m_FreeSwitchDirectory;
        private FreeSwitchDialplan m_FreeSwitchDialplan;
        
        private IConfig m_config;

        public void Initialise(Scene scene, IConfigSource config)
        {

            m_config = config.Configs["FreeSwitchVoice"];

            if (null == m_config)
            {
                m_log.Info("[FreeSwitchVoice] no config found, plugin disabled");
                return;
            }

            if (!m_config.GetBoolean("enabled", false))
            {
                m_log.Info("[FreeSwitchVoice] plugin disabled by configuration");
                return;
            }

            // This is only done the FIRST time this method is invoked.
            if (m_WOF)
            {
                m_pluginEnabled = true;
                m_WOF = false;

                try
                {
                    m_freeSwitchServerUser = m_config.GetString("freeswitch_server_user", String.Empty);
                    m_freeSwitchServerPass = m_config.GetString("freeswitch_server_pass", String.Empty);
                    m_freeSwitchAPIPrefix = m_config.GetString("freeswitch_api_prefix", String.Empty);
                    
                    // XXX: get IP address of HTTP server. (This can be this OpenSim server or another, or could be a dedicated grid service or may live on the freeswitch server)
                     
                    string serviceIP = m_config.GetString("freeswitch_service_server", String.Empty);
                    int servicePort = m_config.GetInt("freeswitch_service_port", 80);
                    IPAddress serviceIPAddress = IPAddress.Parse(serviceIP);
                    // m_FreeSwitchServiceIP = new IPEndPoint(serviceIPAddress, servicePort);
                    m_freeSwitchServicePort = servicePort;
                    m_freeSwitchRealm = m_config.GetString("freeswitch_realm", String.Empty);
                    m_freeSwitchSIPProxy = m_config.GetString("freeswitch_sip_proxy", m_freeSwitchRealm);
                    m_freeSwitchAttemptUseSTUN = m_config.GetBoolean("freeswitch_attempt_stun", true);
                    m_freeSwitchSTUNServer = m_config.GetString("freeswitch_stun_server", m_freeSwitchRealm);
                    m_freeSwitchEchoServer = m_config.GetString("freeswitch_echo_server", m_freeSwitchRealm);
                    m_freeSwitchEchoPort = m_config.GetInt("freeswitch_echo_port", 50505);
                    m_freeSwitchDefaultWellKnownIP = m_config.GetString("freeswitch_well_known_ip", m_freeSwitchRealm);
                    m_openSimWellKnownHTTPAddress = m_config.GetString("opensim_well_known_http_address", serviceIPAddress.ToString());
                    m_freeSwitchDefaultTimeout = m_config.GetInt("freeswitch_default_timeout", 5000);
                    // m_freeSwitchSubscribeRetry = m_config.GetInt("freeswitch_subscribe_retry", 120);
                    m_freeSwitchUrlResetPassword = m_config.GetString("freeswitch_password_reset_url", String.Empty);
                    
                    if (String.IsNullOrEmpty(m_freeSwitchServerUser) ||
                        String.IsNullOrEmpty(m_freeSwitchServerPass) ||
                        String.IsNullOrEmpty(m_freeSwitchRealm) ||
                        String.IsNullOrEmpty(m_freeSwitchAPIPrefix))
                    {
                        m_log.Error("[FreeSwitchVoice] plugin mis-configured");
                        m_log.Info("[FreeSwitchVoice] plugin disabled: incomplete configuration");
                        return;
                    }

                    // set up http request handlers for
                    // - prelogin: viv_get_prelogin.php
                    // - signin: viv_signin.php
                    scene.CommsManager.HttpServer.AddHTTPHandler(String.Format("{0}/viv_get_prelogin.php", m_freeSwitchAPIPrefix),
                                                                 FreeSwitchSLVoiceGetPreloginHTTPHandler);
                                                                 
                   // RestStreamHandler h = new
                   // RestStreamHandler("GET", 
                   // String.Format("{0}/viv_get_prelogin.php", m_freeSwitchAPIPrefix), FreeSwitchSLVoiceGetPreloginHTTPHandler);
                  //  scene.CommsManager.HttpServer.AddStreamHandler(h);
                    
                    scene.CommsManager.HttpServer.AddHTTPHandler(String.Format("{0}/viv_signin.php", m_freeSwitchAPIPrefix),
                                                                 FreeSwitchSLVoiceSigninHTTPHandler);

                    // set up http request handlers to provide
                    // on-demand FreeSwitch configuration to
                    // FreeSwitch's mod_curl_xml
                    scene.CommsManager.HttpServer.AddHTTPHandler(String.Format("{0}/freeswitch-config", m_freeSwitchAPIPrefix),
                                                                 FreeSwitchConfigHTTPHandler);
                    
                    m_log.InfoFormat("[FreeSwitchVoice] using FreeSwitch server {0}", m_freeSwitchRealm);
                    
                    m_FreeSwitchDirectory = new FreeSwitchDirectory();
                    m_FreeSwitchDialplan = new FreeSwitchDialplan();

                    m_pluginEnabled = true;
                    m_WOF = false;

                    m_log.Info("[FreeSwitchVoice] plugin enabled");
                }
                catch (Exception e)
                {
                    m_log.ErrorFormat("[FreeSwitchVoice] plugin initialization failed: {0}", e.Message);
                    m_log.DebugFormat("[FreeSwitchVoice] plugin initialization failed: {0}", e.ToString());
                    return;
                }
            }

            if (m_pluginEnabled) 
            {
                // we need to capture scene in an anonymous method
                // here as we need it later in the callbacks
                scene.EventManager.OnRegisterCaps += delegate(UUID agentID, Caps caps)
                    {
                        OnRegisterCaps(scene, agentID, caps);
                    };

                
                
            }
        }
        
        public void PostInitialise()
        {
        }

        public void Close()
        {
        }

        public string Name
        {
            get { return "FreeSwitchVoiceModule"; }
        }

        public bool IsSharedModule
        {
            get { return true; }
        }

        
        // <summary>
        // OnRegisterCaps is invoked via the scene.EventManager
        // everytime OpenSim hands out capabilities to a client
        // (login, region crossing). We contribute two capabilities to
        // the set of capabilities handed back to the client:
        // ProvisionVoiceAccountRequest and ParcelVoiceInfoRequest.
        // 
        // ProvisionVoiceAccountRequest allows the client to obtain
        // the voice account credentials for the avatar it is
        // controlling (e.g., user name, password, etc).
        // 
        // ParcelVoiceInfoRequest is invoked whenever the client
        // changes from one region or parcel to another.
        //
        // Note that OnRegisterCaps is called here via a closure
        // delegate containing the scene of the respective region (see
        // Initialise()).
        // </summary>
        public void OnRegisterCaps(Scene scene, UUID agentID, Caps caps)
        {
            m_log.DebugFormat("[FreeSwitchVoice] OnRegisterCaps: agentID {0} caps {1}", agentID, caps);

            string capsBase = "/CAPS/" + caps.CapsObjectPath;
            caps.RegisterHandler("ProvisionVoiceAccountRequest",
                                 new RestStreamHandler("POST", capsBase + m_provisionVoiceAccountRequestPath,
                                                       delegate(string request, string path, string param,
                                                                OSHttpRequest httpRequest, OSHttpResponse httpResponse)
                                                       {
                                                           return ProvisionVoiceAccountRequest(scene, request, path, param,
                                                                                               agentID, caps);
                                                       }));
            caps.RegisterHandler("ParcelVoiceInfoRequest",
                                 new RestStreamHandler("POST", capsBase + m_parcelVoiceInfoRequestPath,
                                                       delegate(string request, string path, string param,
                                                                OSHttpRequest httpRequest, OSHttpResponse httpResponse)
                                                       {
                                                           return ParcelVoiceInfoRequest(scene, request, path, param,
                                                                                         agentID, caps);
                                                       }));
            caps.RegisterHandler("ChatSessionRequest",
                                 new RestStreamHandler("POST", capsBase + m_chatSessionRequestPath,
                                                       delegate(string request, string path, string param,
                                                                OSHttpRequest httpRequest, OSHttpResponse httpResponse)
                                                       {
                                                           return ChatSessionRequest(scene, request, path, param,
                                                                                     agentID, caps);
                                                       }));
        }

        /// <summary>
        /// Callback for a client request for Voice Account Details
        /// </summary>
        /// <param name="scene">current scene object of the client</param>
        /// <param name="request"></param>
        /// <param name="path"></param>
        /// <param name="param"></param>
        /// <param name="agentID"></param>
        /// <param name="caps"></param>
        /// <returns></returns>
        public string ProvisionVoiceAccountRequest(Scene scene, string request, string path, string param,
                                                   UUID agentID, Caps caps)
        {
            ScenePresence avatar = scene.GetScenePresence(agentID);
            string avatarName = avatar.Name;

            try
            {
                m_log.DebugFormat("[FreeSwitchVoice][PROVISIONVOICE]: request: {0}, path: {1}, param: {2}",
                                  request, path, param);

                //XmlElement    resp;
                string agentname = "x" + Convert.ToBase64String(agentID.GetBytes());
                string password  = "1234";//temp hack//new UUID(Guid.NewGuid()).ToString().Replace('-','Z').Substring(0,16);

                // XXX: we need to cache the voice credentials, as
                // FreeSwitch is later going to come and ask us for
                // those
                agentname = agentname.Replace('+', '-').Replace('/', '_');
                
               // LLSDVoiceAccountResponse voiceAccountResponse =
               //     new LLSDVoiceAccountResponse(agentname, password, m_freeSwitchRealm, "http://etsvc02.hursley.ibm.com/api");
               LLSDVoiceAccountResponse voiceAccountResponse =
                   new LLSDVoiceAccountResponse(agentname, password, m_freeSwitchRealm,
                                                String.Format("http://{0}:{1}{2}/", m_openSimWellKnownHTTPAddress, 
                                                              m_freeSwitchServicePort, m_freeSwitchAPIPrefix)); 

                string r = LLSDHelpers.SerialiseLLSDReply(voiceAccountResponse);

                m_log.DebugFormat("[FreeSwitchVoice][PROVISIONVOICE]: avatar \"{0}\": {1}", avatarName, r);

                return r;
            }
            catch (Exception e)
            {
                m_log.ErrorFormat("[FreeSwitchVoice][PROVISIONVOICE]: avatar \"{0}\": {1}, retry later", avatarName, e.Message);
                m_log.DebugFormat("[FreeSwitchVoice][PROVISIONVOICE]: avatar \"{0}\": {1} failed", avatarName, e.ToString());

                return "<llsd>undef</llsd>";
            }
        }

        /// <summary>
        /// Callback for a client request for ParcelVoiceInfo
        /// </summary>
        /// <param name="scene">current scene object of the client</param>
        /// <param name="request"></param>
        /// <param name="path"></param>
        /// <param name="param"></param>
        /// <param name="agentID"></param>
        /// <param name="caps"></param>
        /// <returns></returns>
        public string ParcelVoiceInfoRequest(Scene scene, string request, string path, string param,
                                             UUID agentID, Caps caps)
        {
            ScenePresence avatar = scene.GetScenePresence(agentID);
            string avatarName = avatar.Name;

            // - check whether we have a region channel in our cache
            // - if not: 
            //       create it and cache it
            // - send it to the client
            // - send channel_uri: as "sip:regionID@m_sipDomain"
            try
            {
                LLSDParcelVoiceInfoResponse parcelVoiceInfo;
                string channelUri;

                if (null == scene.LandChannel) 
                    throw new Exception(String.Format("region \"{0}\": avatar \"{1}\": land data not yet available",
                                                      scene.RegionInfo.RegionName, avatarName));



                // get channel_uri: check first whether estate
                // settings allow voice, then whether parcel allows
                // voice, if all do retrieve or obtain the parcel
                // voice channel
                LandData land = scene.GetLandData(avatar.AbsolutePosition.X, avatar.AbsolutePosition.Y);

                m_log.DebugFormat("[FreeSwitchVoice][PARCELVOICE]: region \"{0}\": Parcel \"{1}\" ({2}): avatar \"{3}\": request: {4}, path: {5}, param: {6}",
                                  scene.RegionInfo.RegionName, land.Name, land.LocalID, avatarName, request, path, param);

                // TODO: EstateSettings don't seem to get propagated...
                // if (!scene.RegionInfo.EstateSettings.AllowVoice)
                // {
                //     m_log.DebugFormat("[FreeSwitchVoice][PARCELVOICE]: region \"{0}\": voice not enabled in estate settings",
                //                       scene.RegionInfo.RegionName);
                //     channel_uri = String.Empty;
                // }
                // else

                if ((land.Flags & (uint)Parcel.ParcelFlags.AllowVoiceChat) == 0)
                {
                    m_log.DebugFormat("[FreeSwitchVoice][PARCELVOICE]: region \"{0}\": Parcel \"{1}\" ({2}): avatar \"{3}\": voice not enabled for parcel",
                                      scene.RegionInfo.RegionName, land.Name, land.LocalID, avatarName);
                    channelUri = String.Empty;
                }
                else
                {
                    channelUri = ChannelUri(scene, land);
                }

                // fill in our response to the client
                Hashtable creds = new Hashtable();
                creds["channel_uri"] = channelUri;

                parcelVoiceInfo = new LLSDParcelVoiceInfoResponse(scene.RegionInfo.RegionName, land.LocalID, creds);
                string r = LLSDHelpers.SerialiseLLSDReply(parcelVoiceInfo);

                m_log.DebugFormat("[FreeSwitchVoice][PARCELVOICE]: region \"{0}\": Parcel \"{1}\" ({2}): avatar \"{3}\": {4}", 
                                  scene.RegionInfo.RegionName, land.Name, land.LocalID, avatarName, r);
                return r;
            }
            catch (Exception e)
            {
                m_log.ErrorFormat("[FreeSwitchVoice][PARCELVOICE]: region \"{0}\": avatar \"{1}\": {2}, retry later", 
                                  scene.RegionInfo.RegionName, avatarName, e.Message);
                m_log.DebugFormat("[FreeSwitchVoice][PARCELVOICE]: region \"{0}\": avatar \"{1}\": {2} failed", 
                                  scene.RegionInfo.RegionName, avatarName, e.ToString());

                return "<llsd>undef</llsd>";
            }
        }


        /// <summary>
        /// Callback for a client request for ChatSessionRequest
        /// </summary>
        /// <param name="scene">current scene object of the client</param>
        /// <param name="request"></param>
        /// <param name="path"></param>
        /// <param name="param"></param>
        /// <param name="agentID"></param>
        /// <param name="caps"></param>
        /// <returns></returns>
        public string ChatSessionRequest(Scene scene, string request, string path, string param,
                                         UUID agentID, Caps caps)
        {
            ScenePresence avatar = scene.GetScenePresence(agentID);
            string        avatarName = avatar.Name;

            m_log.DebugFormat("[FreeSwitchVoice][CHATSESSION]: avatar \"{0}\": request: {1}, path: {2}, param: {3}",
                              avatarName, request, path, param);
            return "<llsd>true</llsd>";
        }


        public Hashtable FreeSwitchSLVoiceGetPreloginHTTPHandler(Hashtable request)
        {
            m_log.Debug("[FreeSwitchVoice] FreeSwitchSLVoiceGetPreloginHTTPHandler called");
            
            Hashtable response = new Hashtable();
            response["content_type"] = "text/xml";
            response["keepalive"] = false;
            
            response["str_response_string"] = String.Format( 
                "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
                "<VCConfiguration>\r\n"+
                    "<DefaultRealm>{0}</DefaultRealm>\r\n" +
                    "<DefaultSIPProxy>{1}</DefaultSIPProxy>\r\n"+
                    "<DefaultAttemptUseSTUN>{2}</DefaultAttemptUseSTUN>\r\n"+
                    "<DefaultEchoServer>{3}</DefaultEchoServer>\r\n"+
                    "<DefaultEchoPort>{4}</DefaultEchoPort>\r\n"+
                    "<DefaultWellKnownIP>{5}</DefaultWellKnownIP>\r\n"+
                    "<DefaultTimeout>{6}</DefaultTimeout>\r\n"+
                    "<UrlResetPassword>{7}</UrlResetPassword>\r\n"+
                    "<UrlPrivacyNotice>{8}</UrlPrivacyNotice>\r\n"+
                    "<UrlEulaNotice/>\r\n"+
                    "<App.NoBottomLogo>false</App.NoBottomLogo>\r\n"+
                "</VCConfiguration>",
                m_freeSwitchRealm, m_freeSwitchSIPProxy, m_freeSwitchAttemptUseSTUN,
                m_freeSwitchSTUNServer, m_freeSwitchEchoServer, m_freeSwitchEchoPort,
                m_freeSwitchDefaultWellKnownIP, m_freeSwitchDefaultTimeout, 
                m_freeSwitchUrlResetPassword, "");
            
            response["int_response_code"] = 200;

            m_log.DebugFormat("[FreeSwitchVoice] FreeSwitchSLVoiceGetPreloginHTTPHandler return {0}",response["str_response_string"]);
            return response;
        }

        public Hashtable FreeSwitchSLVoiceSigninHTTPHandler(Hashtable request)
        {
            m_log.Debug("[FreeSwitchVoice] FreeSwitchSLVoiceSigninHTTPHandler called");
             
            Hashtable response = new Hashtable();
            response["str_response_string"] = @"<response xsi:schemaLocation=""/xsd/error.xsd"">
                    <level0>
                        <status>OK</status>
                        <body>
                        <code>200</code>
                        <msg>auth successful</msg>
                        </body>
                    </level0>
                </response>";
            response["int_response_code"] = 200;
            return response;
        }


        public Hashtable FreeSwitchConfigHTTPHandler(Hashtable request)
        {
            m_log.DebugFormat("[FreeSwitchVoice] FreeSwitchConfigHTTPHandler called with {0}", (string)request["body"]);
            
            Hashtable response = new Hashtable();
            
            // all the params come as NVPs in the request body
            Hashtable requestBody = parseRequestBody((string) request["body"]);

            // is this a dialplan or directory request 
            string section = (string) requestBody["section"];

            if (section == "directory")
                response = m_FreeSwitchDirectory.HandleDirectoryRequest(requestBody);
            else if (section == "dialplan")
                response = m_FreeSwitchDialplan.HandleDialplanRequest(requestBody);
            else
                m_log.WarnFormat("[FreeSwitchVoice]: section was {0}", section);
            
            // XXX: re-generate dialplan: 
            //      - conf == region UUID
            //      - conf number = region port
            //      -> TODO Initialise(): keep track of regions via events
            //      re-generate accounts for all avatars 
            //      -> TODO Initialise(): keep track of avatars via events
            Regex normalizeEndLines = new Regex(@"\r\n", RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.Multiline);

            m_log.DebugFormat("[FreeSwitchVoice] FreeSwitchConfigHTTPHandler return {0}",normalizeEndLines.Replace(((string)response["str_response_string"]), ""));
            return response;
        }
        
        public Hashtable parseRequestBody(string body)
        {
            Hashtable bodyParams = new Hashtable();
            // split string
            string [] nvps = body.Split(new Char [] {'&'});

            foreach (string s in nvps) {
    
                if (s.Trim() != "")
                {
                    string [] nvp = s.Split(new Char [] {'='});
                    bodyParams.Add(HttpUtility.UrlDecode(nvp[0]), HttpUtility.UrlDecode(nvp[1]));
                }
            }
            
            return bodyParams;
        }

        private string ChannelUri(Scene scene, LandData land)
        {

            string channelUri = null;

            string landUUID;
            string landName;

            // Create parcel voice channel. If no parcel exists, then the voice channel ID is the same
            // as the directory ID. Otherwise, it reflects the parcel's ID.

            if (land.LocalID != 1 && (land.Flags & (uint)Parcel.ParcelFlags.UseEstateVoiceChan) == 0)
            {
                landName = String.Format("{0}:{1}", scene.RegionInfo.RegionName, land.Name);
                landUUID = land.GlobalID.ToString();
                m_log.DebugFormat("[FreeSwitchVoice]: Region:Parcel \"{0}\": parcel id {1}: using channel name {2}", 
                                  landName, land.LocalID, landUUID);
            }
            else
            {
                landName = String.Format("{0}:{1}", scene.RegionInfo.RegionName, scene.RegionInfo.RegionName);
                landUUID = scene.RegionInfo.RegionID.ToString();
                m_log.DebugFormat("[FreeSwitchVoice]: Region:Parcel \"{0}\": parcel id {1}: using channel name {2}", 
                                  landName, land.LocalID, landUUID);
            }
            System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
            channelUri = String.Format("sip:confctl-{0}@{1}", "x" + Convert.ToBase64String(encoding.GetBytes(landUUID)), m_freeSwitchRealm);
            
            //channelUri="sip:confctl-3001@9.20.151.43";
            //channelUri="sip:opensimconf-3001@9.20.151.43";

            return channelUri;
        }
    }
}