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What is SIP – Etag Header Field?

SIP-ETag header field is a branch of the SIP publication mechanism. SIP-ETag header field is returned in a 2xx response to a PUBLISH request.

1. It carries an entity tag exclusively identifying the state information that has been processed.

2. This entity tag can then be used to do provisional publications on this data together with refreshing, modifying, and removing.

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