Appendix A SIP Compliance
RFC 2543 and RFC 3261
Table A-3 SIP Responses (continued)
SIP Response
Meaning
Supported?
Cisco SPS Action
5xx |
|
| ||
|
|
|
|
|
500 | Server internal error | Server or gateway encountered an | Yes | Generates and forwards this |
|
| unexpected error that prevents it from |
| response. |
|
| processing the request. |
|
|
|
|
|
|
|
501 | Not implemented | Server or gateway does not support the |
|
|
|
| functions required to complete the |
|
|
|
| request. |
|
|
|
|
|
|
|
502 | Bad gateway | Server or gateway received an invalid | See Cisco SPS | Forwards this response. |
|
| response from a downstream server. | action |
|
|
|
|
|
|
503 | Service unavailable | Server or gateway is unable to process | Yes | Generates and forwards this |
|
| the request due to an overload or |
| response. |
|
| maintenance problem. |
|
|
|
|
|
|
|
504 | Gateway timeout | Server or gateway did not receive a | See Cisco SPS | Forwards this response. |
|
| timely response from another server | action |
|
|
| (such as a location server). |
|
|
|
|
|
|
|
505 | Version not supported | Server or gateway does not support the | Yes |
|
|
| version of the SIP protocol used in the |
|
|
|
| request. |
|
|
|
|
|
| |
6xx |
|
|
| |
600 | Busy everywhere | Called party was contacted but is busy | See Cisco SPS |
|
| and cannot take the call at this time. | action |
|
|
|
|
603 | Decline | Called party was contacted but cannot |
|
|
| or does not want to participate in the |
|
|
| call. |
|
|
|
|
|
604 | Does not exist anywhere | Server has authoritative information |
|
|
| that the called party does not exist in the |
|
|
| network. |
|
|
|
|
|
606 | Not acceptable | Called party was contacted, but some |
|
|
| aspect of the session description was |
|
|
| unacceptable. |
|
|
|
|
|
Forwards this response.
SIP Header Fields
Note All SIP header fields that concern the Cisco SPS are correctly handled and parsed except for the Hide and Encryption header fields. Header fields that do not directly affect the Cisco SPS or that are unknown to it are passed unaltered in the SIP request.
Cisco SIP Proxy Server Administrator Guide
