diff --git a/OpenSim/Region/Framework/Interfaces/IVoiceModule.cs b/OpenSim/Region/Framework/Interfaces/IVoiceModule.cs
new file mode 100644
index 0000000000..2e555fa092
--- /dev/null
+++ b/OpenSim/Region/Framework/Interfaces/IVoiceModule.cs
@@ -0,0 +1,45 @@
+/*
+ * 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 OpenSimulator 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;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * 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.IO;
+using OpenMetaverse;
+
+namespace OpenSim.Region.Framework.Interfaces
+{
+    public interface IVoiceModule
+    {
+
+        /// <summary>
+        /// Set the SIP url to be used by a parcel, this will allow manual setting of a SIP address
+        /// for a particular piece of land, allowing region owners to use preconfigured SIP conference channels.
+        /// This is used by osSetParcelSIPAddress
+        /// </summary>
+        void setLandSIPAddress(string SIPAddress,UUID GlobalID);
+        
+    }
+}
diff --git a/OpenSim/Region/OptionalModules/Avatar/Voice/FreeSwitchVoice/FreeSwitchVoiceModule.cs b/OpenSim/Region/OptionalModules/Avatar/Voice/FreeSwitchVoice/FreeSwitchVoiceModule.cs
index 65c5274a57..6b30959239 100644
--- a/OpenSim/Region/OptionalModules/Avatar/Voice/FreeSwitchVoice/FreeSwitchVoiceModule.cs
+++ b/OpenSim/Region/OptionalModules/Avatar/Voice/FreeSwitchVoice/FreeSwitchVoiceModule.cs
@@ -53,7 +53,7 @@ using System.Text.RegularExpressions;
 
 namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
 {
-    public class FreeSwitchVoiceModule : IRegionModule
+    public class FreeSwitchVoiceModule : IRegionModule, IVoiceModule
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
@@ -101,13 +101,16 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
         private FreeSwitchDialplan m_FreeSwitchDialplan;
 
         private readonly Dictionary<string, string> m_UUIDName = new Dictionary<string, string>();
+        private Dictionary<string, string> m_ParcelAddress = new Dictionary<string, string>();
+        
+        private Scene m_scene;
         
 
         private IConfig m_config;
 
         public void Initialise(Scene scene, IConfigSource config)
         {
-
+            m_scene = scene;
             m_config = config.Configs["FreeSwitchVoice"];
 
             if (null == m_config)
@@ -230,6 +233,8 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
                     {
                         OnRegisterCaps(scene, agentID, caps);
                     };
+                    
+                
 
                 try
                 {
@@ -255,6 +260,13 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
         
         public void PostInitialise()
         {
+            if(m_pluginEnabled)
+            {
+	            m_log.Info("[FreeSwitchVoice] registering IVoiceModule with the scene");
+	            
+	            // register the voice interface for this module, so the script engine can call us
+	            m_scene.RegisterModuleInterface<IVoiceModule>(this);
+            }
         }
 
         public void Close()
@@ -270,7 +282,27 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
         {
             get { return true; }
         }
-
+        
+        // <summary>
+        // implementation of IVoiceModule, called by osSetParcelSIPAddress script function
+        // </summary>
+        public void setLandSIPAddress(string SIPAddress,UUID GlobalID)
+        {
+            m_log.DebugFormat("[FreeSwitchVoice]: setLandSIPAddress parcel id {0}: setting sip address {1}", 
+                                  GlobalID, SIPAddress);
+                                  
+            lock (m_ParcelAddress)
+            {
+                if (m_ParcelAddress.ContainsKey(GlobalID.ToString()))
+                {
+                    m_ParcelAddress[GlobalID.ToString()] = SIPAddress;
+                }
+                else
+                {
+                    m_ParcelAddress.Add(GlobalID.ToString(), SIPAddress);
+                }
+            }
+        }
         
         // <summary>
         // OnRegisterCaps is invoked via the scene.EventManager
@@ -776,6 +808,16 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
 
             // 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.
+            
+            lock (m_ParcelAddress)
+            {
+                if (m_ParcelAddress.ContainsKey( land.GlobalID.ToString() ))
+                {
+                    m_log.DebugFormat("[FreeSwitchVoice]: parcel id {0}: using sip address {1}", 
+                                      land.GlobalID, m_ParcelAddress[land.GlobalID.ToString()]);
+                    return m_ParcelAddress[land.GlobalID.ToString()];
+                }
+            }
 
             if (land.LocalID != 1 && (land.Flags & (uint)ParcelFlags.UseEstateVoiceChan) == 0)
             {
@@ -797,6 +839,13 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
             // the personal speech indicators as well unless some siren14-3d codec magic happens. we dont have siren143d so we'll settle for the personal speech indicator.
             channelUri = String.Format("sip:conf-{0}@{1}", "x" + Convert.ToBase64String(encoding.GetBytes(landUUID)), m_freeSwitchRealm);
             
+            lock (m_ParcelAddress)
+            {
+                if (!m_ParcelAddress.ContainsKey(land.GlobalID.ToString()))
+                {
+                    m_ParcelAddress.Add(land.GlobalID.ToString(),channelUri);
+                }
+            }
 
             return channelUri;
         }
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index 726b37a077..ccdd4c50a9 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -1164,6 +1164,35 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
             land.SetMediaUrl(url);
         }
+        
+        public void osSetParcelSIPAddress(string SIPAddress)
+        {
+            // What actually is the difference to the LL function?
+            //
+            CheckThreatLevel(ThreatLevel.VeryLow, "osSetParcelMediaURL");
+
+            m_host.AddScriptLPS(1);
+            
+
+            ILandObject land
+                = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y);
+
+            if (land.landData.OwnerID != m_host.ObjectOwner)
+            {
+                OSSLError("osSetParcelSIPAddress: Sorry, you need to own the land to use this function");
+                return;
+            }
+            
+            // get the voice module
+            IVoiceModule voiceModule = World.RequestModuleInterface<IVoiceModule>();
+            
+            if (voiceModule != null) 
+                voiceModule.setLandSIPAddress(SIPAddress,land.landData.GlobalID);
+            else
+                OSSLError("osSetParcelSIPAddress: No voice module enabled for this land");
+            
+            
+        }
 
         public string osGetScriptEngineName()
         {
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
index 49aa45a017..d8d3c31dd4 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
@@ -75,6 +75,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api.Interfaces
         bool osConsoleCommand(string Command);
         void osSetParcelMediaURL(string url);
         void osSetPrimFloatOnWater(int floatYN);
+        void osSetParcelSIPAddress(string SIPAddress);
 
         // Avatar Info Commands
         string osGetAgentIP(string agent);
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
index 8f52d99418..d0df3902ad 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
@@ -183,6 +183,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
         {
             m_OSSL_Functions.osSetParcelMediaURL(url);
         }
+        
+        public void osSetParcelSIPAddress(string SIPAddress)
+        {
+            m_OSSL_Functions.osSetParcelSIPAddress(SIPAddress);
+        }
 
         public void osSetPrimFloatOnWater(int floatYN)
         {