?– 604 Does Not Exist Anymore This is sent when the subscriber being addressed
is no longer a valid subscriber in the requested network.
?– 606 Not Acceptable This means that the server is willing to accept the request
but is unable to support the session as it is described in the message body. The
WARNING header provides the reason for not accepting the session.
Global failures typically indicate to the subscriber that the requestor it is attempting
to reach is not available anyplace in the network or might not even be a valid subscriber
in the network.
Parameters in all of these responses provide additional details as to why a request
is being rejected, and may provide other details as well. For exact definitions on how
these responses are used, refer to Chapters 5 and 6 on establishing sessions, registering
in the IMS, and releasing sessions in progress.
Session Initiation Protocol (SIP) 69
The following section describes all of the headers used in the IMS as defined by the
IETF and as defined through extensions by the 3GPP. Most all of these are defined
in the RFC 3261 published by the IETF; however, when extensions are defined, they
are not found in this RFC. Rather, they are published in various other specifications
published by the 3GPP. This makes defining some of these extensions difficult without
tracking all of the activities of the 3GPP and the documents published.
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