The SIP-ETag header is used by a server (event state collector) in a 2xx response to PUBLISH in order to convey a unique entity tag for the published state. The client may then use this tag in a {@link javax.sip.header.SIPIfMatchHeader} to update previously published state.
Sample syntax:SIP-ETag: dx200xyz
A server must ignore Headers that it does not understand. A proxy must not remove or modify Headers that it does not understand. @author BEA Systems, NIST @since 1.2
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