Appendix A SIP Compliance with RFC-2543 Information
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| SIP Responses |
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4xx Response | Supported? | Comments | |
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407 Proxy | See comments | This response is only received in this | |
Authentication |
| release. | |
Required |
| The 407 Proxy Authentication Required | |
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| response indicates that the phone must | |
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| first authenticate itself with the proxy | |
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| server. If received by the phone, the | |
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| phone may repeat the INVITE request | |
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| with a suitable | |
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| field. This field should contain the | |
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| authentication information of the user | |
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| agent for the next outbound proxy or | |
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| gateway. | |
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408 Request | See comments | The SIP phone does not generate a 408 | |
Timeout |
| Request Timeout response. For an | |
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| incoming response, the gateway initiates | |
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| a graceful call disconnect (during which | |
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| the caller hears a busy or fast busy tone) | |
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| before clearing the call request. | |
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409 Conflict | See comments | This response is only received the phone | |
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| in this release. | |
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| The 409 Conflict response indicates that | |
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| the INVITE request could not be process | |
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| because of a conflict with the current | |
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| state of the resource. If this response is | |
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| received, the user is notified. | |
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410 Gone | See comments | This response is only received by the | |
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| phone in this release. | |
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| The 410 Gone response indicates that a | |
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| resource is no longer available at the | |
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| server and no forwarding address is | |
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| known. | |
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| Cisco SIP IP Phone 7960 Administrator Guide |
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