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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Unpublished - rights reserved under the Copyright Laws of the United States. Copyright � 2003 Sun Microsystems, Inc. All rights reserved. Copyright � 2005 BEA Systems, Inc. All rights reserved. Use is subject to license terms. This distribution may include materials developed by third parties. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Module Name : JSIP Specification File Name : Author : Phelim O'Doherty HISTORY Version Date Author Comments 1.1 08/10/2002 Phelim O'Doherty ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 package javax.sip.header;
The Call-ID header field uniquely identifies a particular invitation or all registrations of a particular client. A single multimedia conference can give rise to several calls with different Call-IDs, for example, if a user invites a single individual several times to the same (long-running) conference. Call-IDs are case-sensitive and are simply compared byte-by-byte.

Call-ID is generated by the combination of a random string and the softphone's host name or IP address. The combination of the To tag, From tag, and Call-ID completely defines a peer-to-peer SIP relationship between two users and is referred to as a dialog. It MUST be the same for all requests and responses sent by either User Agent in a dialog. It SHOULD be the same in each registration from a User Agent.

All SIP User Agents must have a means to guarantee that the Call-ID header fields they produce will not be inadvertently generated by any other User Agent. Note that when requests are retried after certain failure responses that solicit an amendment to a request (for example, a challenge for authentication), these retried requests are not considered new requests, and therefore do not need new Call-ID header fields.

Use of cryptographically random identifiers in the generation of Call-IDs is RECOMMENDED. Implementations MAY use the form "localid@host".

For Example:

BEA Systems, NIST
 public interface CallIdHeader extends Header {

Sets the Call-Id of the CallIdHeader. The CallId parameter uniquely identifies a serious of messages within a dialogue.

callId - the string value of the Call-Id of this CallIdHeader.
java.text.ParseException which signals that an error has been reached unexpectedly while parsing the callId value.
    public void setCallId(String callIdthrows ParseException;

Returns the Call-Id of CallIdHeader. The CallId parameter uniquely identifies a series of messages within a dialogue.

the String value of the Call-Id of this CallIdHeader
    public String getCallId();

Compare this CallIdHeader for equality with another. This method overrides the equals method in javax.sip.Header. This method specifies object equality as outlined by RFC3261. Call-IDs are case-sensitive and are simply compared byte-by-byte.

obj the object to compare this CallIdHeader with.
true if obj is an instance of this class representing the same CallIdHeader as this, false otherwise.
    public boolean equals(Object obj);    

Name of CallIdHeader
    public final static String NAME = "Call-ID";
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