[SIPForum-discussion] Re : SIP Response - 410 Gone: The user existed once, but is not available here any more.

[Alina Behera]

Hi ,The 4XX response comes for authorization. But in this scenario i think the user agent is deregistered in server before the expiry interval .Thats why it is sending 410 response .you can refer the rfc 4411 also .CheersAlina
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