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RequireHeader (JSIP API v1.2)
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<b>JSIP API v1.2<br><font size=-1>November 2006</font></b></EM>
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javax.sip.header</FONT>
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Interface RequireHeader</H2>
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<DT><B>All Superinterfaces:</B> <DD>java.lang.Cloneable, <A HREF="../../../javax/sip/header/Header.html" title="interface in javax.sip.header">Header</A>, <A HREF="../../../javax/sip/header/OptionTag.html" title="interface in javax.sip.header">OptionTag</A>, java.io.Serializable</DD>
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<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../javax/sip/header/ProxyRequireHeader.html" title="interface in javax.sip.header">ProxyRequireHeader</A></DD>
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<DT><PRE>public interface <B>RequireHeader</B><DT>extends <A HREF="../../../javax/sip/header/OptionTag.html" title="interface in javax.sip.header">OptionTag</A>, <A HREF="../../../javax/sip/header/Header.html" title="interface in javax.sip.header">Header</A></DL>
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The Require header field is used by UACs to tell UASs about options that the UAC expects the UAS to support in order to process the request. Although an optional header field, the Require MUST NOT be ignored if it is present. <p> The Require header field contains a list of option tags. Each option tag defines a SIP extension that MUST be understood to process the request. Frequently, this is used to indicate that a specific set of extension header fields need to be understood. A UAC compliant to this specification MUST only include option tags corresponding to standards-track RFCs. <p> If a server does not understand the option, it must respond by returning a BAD_EXTENSION Response and list those options it does not understand in the UnsupportedHeader. <p> Proxy and redirect servers must ignore features that are not understood. If a particular extension requires that intermediate devices support it, the extension must be tagged in the ProxyRequireHeader as well. <p> For Example:<br> <code>Require: 100rel</code>
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<DT><B>Author:</B></DT>
<DD>BEA Systems, NIST</DD>
<DT><B>See Also:</B><DD><A HREF="../../../javax/sip/header/ProxyRequireHeader.html" title="interface in javax.sip.header"><CODE>ProxyRequireHeader</CODE></A>,
<A HREF="../../../javax/sip/header/OptionTag.html" title="interface in javax.sip.header"><CODE>OptionTag</CODE></A></DL>
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<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/sip/header/RequireHeader.html#NAME">NAME</A></B></CODE>
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Name of RequireHeader</TD>
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<TH ALIGN="left"><B>Methods inherited from interface javax.sip.header.<A HREF="../../../javax/sip/header/OptionTag.html" title="interface in javax.sip.header">OptionTag</A></B></TH>
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<TD><CODE><A HREF="../../../javax/sip/header/OptionTag.html#getOptionTag()">getOptionTag</A>, <A HREF="../../../javax/sip/header/OptionTag.html#setOptionTag(java.lang.String)">setOptionTag</A></CODE></TD>
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<TH ALIGN="left"><B>Methods inherited from interface javax.sip.header.<A HREF="../../../javax/sip/header/Header.html" title="interface in javax.sip.header">Header</A></B></TH>
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<TD><CODE><A HREF="../../../javax/sip/header/Header.html#clone()">clone</A>, <A HREF="../../../javax/sip/header/Header.html#equals(java.lang.Object)">equals</A>, <A HREF="../../../javax/sip/header/Header.html#getName()">getName</A>, <A HREF="../../../javax/sip/header/Header.html#hashCode()">hashCode</A>, <A HREF="../../../javax/sip/header/Header.html#toString()">toString</A></CODE></TD>
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<A NAME="NAME"><!-- --></A><H3>
NAME</H3>
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static final java.lang.String <B>NAME</B></PRE>
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<DD>Name of RequireHeader
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<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#javax.sip.header.RequireHeader.NAME">Constant Field Values</A></DL>
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<b>JSIP API v1.2<br><font size=-1>November 2006</font></b></EM>
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<center>If you have any comments, please mail them to <a href=mailto:JAIN-SIP-INTEREST@java.sun.com>JAIN-SIP-INTEREST@java.sun.com</a> after subscribing at <a href=http://archives.java.sun.com>http://archives.java.sun.com</a><br><a href=../../../copyright.html>Copyright</a> - 2006 BEA Systems and Sun Microsystems</center>
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