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What is Retry – After Header Field in SIP?

Retry – After header field is used to signify when a resource or service may be available again.

1. In 503 Service Unavailable responses, it signifies when the server will be available.

2. In 404 Not Found, 600 Busy Everywhere, and 603 Decline responses, it signifies when the called UA may be available again.

3. It carries time period in ‘sec’.

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