Appendix A SIP Compliance
RFC 2543 and RFC 3261
Table | SIP Responses (continued) |
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SIP Response |
| Meaning | Supported? | Cisco SPS Action | |
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415 | Unsupported media | Server refuses to process the request | Yes | Forwards this response. | |
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| because the format of the body is not |
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| supported by the destination endpoint. |
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420 | Bad extension | Server cannot understand the protocol | Yes | Generates and forwards this | |
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| extension indicated in the Require |
| response. |
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| header. |
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480 | Temporarily | Called party was contacted but is | Yes | Forwards this response. If | |
| unavailable | temporarily unavailable. |
| preauthentication is enabled and | |
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| fails, generates this response. |
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481 | Call leg/transaction | Server ignores the request because it is | Yes | Generates and forwards this | |
| does not exist | either a BYE for which there is no |
| response. | |
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| matching leg ID or a CANCEL for |
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| which there is no matching transaction. |
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482 | Loop detected | Server received a request that includes |
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| itself in the path. |
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483 | Too many hops | Server received a request that requires |
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| more hops than allowed by the |
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484 | Address incomplete | Server received a request that contains | See Cisco SPS | Forwards this response. | |
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| an incomplete address. | action |
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485 | Ambiguous | Server received a request that contains |
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| an ambiguous |
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| can provide possible alternative |
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| addresses. |
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486 | Busy here | Called party was contacted but his or |
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| her system is unable to take additional |
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| calls. |
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487 | Busy here; request | Request was terminated by a BYE or | Yes |
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| cancelled |
| CANCEL request. |
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488 | Not acceptable media | An error in handling the request | See Cisco SPS |
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| occurred. | action |
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Cisco SIP Proxy Server Administrator Guide
