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SIP - 3xx: Redirect Responses
Generally these class responses are sent by redirect servers in response to INVITE. They are also known as redirect class responses. It includes the following responses −
300 Multiple Choices
It contains multiple Contact header fields to indicate that the location service has returned multiple possible locations for the SIP URI in the Request-URI.
301 Moved Permanently
This redirection response contains a Contact header field with the new URI of the called party.
The address can be saved and used in future INVITE requests.
302 Moved Temporarily
This redirection response contains a URI that is currently valid but is not permanent.
That is, for the specified duration of time the location is valid.
305 Use Proxy
This response points to certain proxy server which is having some authoritative information about the calling party.
This response could be sent by a UAS issuing a proxy for incoming call screening.
380 Alternative Service
This response returns a URI that indicates the type of service the called party would like.
For example, a call could be redirected to a voicemail server.
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