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diff --git a/java/gov/nist/javax/sip/header/To.java b/java/gov/nist/javax/sip/header/To.java
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+/*
+ * Conditions Of Use
+ *
+ * This software was developed by employees of the National Institute of
+ * Standards and Technology (NIST), an agency of the Federal Government.
+ * Pursuant to title 15 Untied States Code Section 105, works of NIST
+ * employees are not subject to copyright protection in the United States
+ * and are considered to be in the public domain.  As a result, a formal
+ * license is not needed to use the software.
+ *
+ * This software is provided by NIST as a service and is expressly
+ * provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
+ * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
+ * AND DATA ACCURACY.  NIST does not warrant or make any representations
+ * regarding the use of the software or the results thereof, including but
+ * not limited to the correctness, accuracy, reliability or usefulness of
+ * the software.
+ *
+ * Permission to use this software is contingent upon your acceptance
+ * of the terms of this agreement
+ *
+ * .
+ *
+ */
+/*******************************************************************************
+ * Product of NIST/ITL Advanced Networking Technologies Division (ANTD).       *
+ *******************************************************************************/
+package gov.nist.javax.sip.header;
+
+import gov.nist.core.HostPort;
+import gov.nist.javax.sip.address.AddressImpl;
+import gov.nist.javax.sip.parser.Parser;
+
+import javax.sip.header.ToHeader;
+import java.text.ParseException;
+
+/**
+ * To SIP Header.
+ *
+ * @version 1.2 $Revision: 1.11 $ $Date: 2009/07/17 18:57:39 $
+ *
+ * @author M. Ranganathan <br/>
+ * @author Olivier Deruelle <br/>
+ *
+ *
+ *
+ */
+
+public final class To extends AddressParametersHeader implements
+        javax.sip.header.ToHeader {
+
+    /**
+     * Comment for <code>serialVersionUID</code>
+     */
+    private static final long serialVersionUID = -4057413800584586316L;
+
+    /**
+     * default Constructor.
+     */
+    public To() {
+        super(TO,true);
+    }
+
+    /**
+     * Generate a TO header from a FROM header
+     */
+    public To(From from) {
+        super(TO);
+        setAddress(from.address);
+        setParameters(from.parameters);
+    }
+
+    /**
+     * Encode the header into a String.
+     *
+     * @since 1.0
+     * @return String
+     */
+    public String encode() {
+        return headerName + COLON + SP + encodeBody() + NEWLINE;
+    }
+
+    /**
+     * Encode the header content into a String.
+     *
+     * @return String
+     */
+    protected String encodeBody() {
+        return encodeBody(new StringBuffer()).toString();
+    }
+
+    protected StringBuffer encodeBody(StringBuffer buffer) {
+        if (address != null) {
+            if (address.getAddressType() == AddressImpl.ADDRESS_SPEC) {
+                buffer.append(LESS_THAN);
+            }
+            address.encode(buffer);
+            if (address.getAddressType() == AddressImpl.ADDRESS_SPEC) {
+                buffer.append(GREATER_THAN);
+            }
+
+            if (!parameters.isEmpty()) {
+                buffer.append(SEMICOLON);
+                parameters.encode(buffer);
+            }
+        }
+        return buffer;
+    }
+
+    /**
+     * Conveniance accessor function to get the hostPort field from the address.
+     * Warning -- this assumes that the embedded URI is a SipURL.
+     *
+     * @return hostport field
+     */
+    public HostPort getHostPort() {
+        if (address == null)
+            return null;
+        return address.getHostPort();
+    }
+
+    /**
+     * Get the display name from the address.
+     *
+     * @return Display name
+     */
+    public String getDisplayName() {
+        if (address == null)
+            return null;
+        return address.getDisplayName();
+    }
+
+    /**
+     * Get the tag parameter from the address parm list.
+     *
+     * @return tag field
+     */
+    public String getTag() {
+        if (parameters == null)
+            return null;
+        return getParameter(ParameterNames.TAG);
+
+    }
+
+    /**
+     * Boolean function
+     *
+     * @return true if the Tag exist
+     */
+    public boolean hasTag() {
+        if (parameters == null)
+            return false;
+        return hasParameter(ParameterNames.TAG);
+
+    }
+
+    /**
+     * remove Tag member
+     */
+    public void removeTag() {
+            if (parameters != null)
+                parameters.delete(ParameterNames.TAG);
+
+    }
+
+    /**
+     * Set the tag member. This should remain empty for the initial request in
+     * a dialog.
+     *
+     * @param t - tag String to set.
+     */
+    public void setTag(String t) throws ParseException {
+        // JvB: check that it is a valid token
+        Parser.checkToken(t);
+        this.setParameter(ParameterNames.TAG, t);
+    }
+
+    /**
+     * Get the user@host port string.
+     */
+    public String getUserAtHostPort() {
+        if (address == null)
+            return null;
+        return address.getUserAtHostPort();
+    }
+
+    public boolean equals(Object other) {
+        return (other instanceof ToHeader) && super.equals(other);
+    }
+}