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What is Min – Expires Header Field in SIP?

The Min-Expires header field is used in a 423 Interval Too Brief response from a registrar declining a REGISTER request in which one or more Contacts have an ending time that is too short.

1. The header field holds an integer number of seconds that makes up the minimum expiration interval that the registrar will accept.

2. A client receiving this header field can update the expiration intervals of the registration request consequently and resend the REGISTER request.

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