?– 504 Server Time-out This is sent when waiting for a response from an entity in
another network and the response timer expires.
?– 505 Version Not Supported Indicates the server does not support the SIP version
specified in the request.
?– 513 Message Too Large This is sent when the received request was too large
for the server to process.
6xx Global Failure Responses The rest of the possible error scenarios are covered by
the Global Failure responses. These responses are used when a session fails and there
is no way to reach a subscriber at any of that subscriber??™s locations.
For example, a subscriber may have several devices registered in different networks.
A call would typically be routed to the device addressed in the request, but the subscriber
may have configured their services so that the request for a session is redirected
to one of their other registered devices (e.g., call forwarding).
If all of the registered devices are unavailable, this would be considered a global failure
because the subscriber cannot be reached at any location in the network. Following
are the defined responses:
?– 600 Busy Everywhere This is sent when the recipient of a request knows that
a subscriber is not available anywhere in the network (this might typically be used
by a Presence server for example).
?– 603 Decline This is similar to the 600 response, but there is no reason code
provided.
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