Appendix A SIP Compliance with
SIP Responses
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| 4xx Response | Supported? | Comments | |
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| 401 Unauthorized | Yes | This response is only received in this | |
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| release. | |
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| If a 401 Unauthorized response is | |
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| received during registration, the phone | |
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| accepts the response and sends a new | |
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| request that contains the user’s | |
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| authentication information in the format | |
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| of the HTTP digest as modified by | |
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| RFC 2543. | |
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| 402 Payment | Yes | The phone does not generate the 402 | |
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| Required |
| Payment Required response. | |
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| 403 Forbidden | Yes | This response is only received in this | |
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| release. | |
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| If the phone receives a 403 Forbidden | |
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| response, it notifies the user of the | |
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| response. This response indicates that | |
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| the SIP server has the request but will | |
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| not provide service. | |
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| 404 Not Found | Yes | The Cisco SIP IP phone generates this | |
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| response if it is unable to locate the | |
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| callee. Upon receiving this response, the | |
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| phone notifies the user. | |
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| 405 Method Not | See comments | This response is only received in this | |
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| Allowed |
| release. | |
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| If the phone receives a 405 Method Not | |
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| Allowed response, it notifies the user of | |
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| the response. | |
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| 406 Not | See comments | The SIP phone does not generate a 406 | |
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| Acceptable |
| Not Acceptable 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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| Cisco SIP IP Phone 7960 Administrator Guide |
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