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.