Appendix A SIP Compliance
RFC 2543 and RFC 3261
•5xx
•6xx
Table | SIP Responses |
SIP Response
Meaning
Supported?
Cisco SPS Action
1xx |
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100 | Trying | Action is being taken on behalf of the | Yes | Generates and forwards this |
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| caller, but the called party is not yet |
| response for an incoming |
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| located. |
| INVITE. Upon receiving this |
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| response, waits for a 180 |
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| Ringing, 183 Session progress, |
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| or 200 OK response. |
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180 | Ringing | Called party is located and is being | Yes | Forwards this response. |
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| notified of the call. |
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181 | Call is being forwarded | Call is being rerouted to another | Yes |
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| destination. |
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182 | Queued | Called party is not currently available or | Yes |
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| elects to queue the call rather than reject |
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| it. |
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183 | Session progress | System performs inband alerting for the | Yes |
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| caller. |
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2xx
200 OK
Request has been successfully processed. The action taken depends on the request made.
Yes
Generates this response to a REGISTER or CANCEL request. Otherwise forwards this response.
3xx
300 | Multiple choices | Address resolves to more than one | Yes |
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| location. All locations are provided and |
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| the user or UA can select which location |
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| to use. |
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301 | Moved permanently | User is no longer available at the | Yes |
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| specified location. An alternate location |
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| is included in the header. |
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302 | Moved temporarily | User is temporarily unavailable at the | Yes |
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| specified location. An alternate location |
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| is included in the header. |
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305 | Use proxy | Caller must use a proxy to contact the | Yes |
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| called party. |
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380 | Alternative service | Call is unsuccessful, but alternative | Yes |
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| services are available. |
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Does not generate this response. If recursive is enabled, recurses on all contacts; otherwise forwards this response.
In redirect mode, generates this response when it locates one or more contacts. In proxy mode, if recursive is enabled, recurses on all contacts; otherwise forwards this response.
Does not generate this response. If recursive is enabled, recurses on all contacts; otherwise forwards this response.
Cisco SIP Proxy Server Administrator Guide