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Classes of SIP Responses

SIP responses provide status information about SIP transactions and include a response code and a reason phrase. SIP responses are grouped into the following classes:

Informational (100 to 199)—Request received, continuing to process the request.
Success (200 to 299)—Action successfully received, understood, and accepted.
Redirection (300 to 399)—Further action required to complete the request.
Client Error (400 to 499)—Request contains bad syntax or cannot be fulfilled at this server.
Server Error (500 to 599)—Server failed to fulfill an apparently valid request.
Global Failure (600 to 699)—Request cannot be fulfilled at any server.

Table 62 provides a complete list of current SIP responses, all of which are supported on J-series devices.

Table 62: SIP Responses

Informational	100 Trying	180 Ringing	181 Call is being forwarded
Informational	182 Queued	183 Session progress
Success	200 OK	202 Accepted
Redirection	300 Multiple choices	301 Moved permanently	302 Moved temporarily
Redirection	305 Use proxy	380 Alternative service
Client Error	400 Bad request	401 Unauthorized	402 Payment required
	403 Forbidden	404 Not found	405 Method not allowed
	406 Not acceptable	407 Proxy authentication required	408 Request time-out
	409 Conflict	410 Gone	411 Length required
	413 Request entity too large	414 Request-URL too large	415 Unsupported media type
	420 Bad extension	480 Temporarily not available	481 Call leg/transaction does not exist
	482 Loop detected	483 Too many hops	484 Address incomplete
	485 Ambiguous	486 Busy here	487 Request canceled
	488 Not acceptable here
Server Error	500 Server internal error	501 Not implemented	502 Bad gateway
Server Error	502 Service unavailable	504 Gateway time-out	505 SIP version not supported
Global Failure	600 Busy everywhere	603 Decline	604 Does not exist anywhere
Global Failure	606 Not acceptable

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