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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480 | Temporarily | See comments | This response is only received by the | ||||||
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| Unavailable |
| phone in this release. The user is notified | |||||
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| if this response is received. | ||||
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| If this response is received, the user is | ||||
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| notified that the callee is temporarily | ||||
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| unavailable (perhaps not logged on) and | ||||
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| any retry information is displayed. | ||||
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481 | Call |
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| Leg/Transaction |
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| Does Not Exist |
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| This response is only received by the | |||||
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| 482 Loop Detected |
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| See comments | phone in this release. The user is notified | ||||
483 | Too Many | ||||||||
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| Hops |
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484 | Address |
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| Incomplete |
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485 | Ambiguous | See comments | This response is only received by the | ||||||
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| phone in this release. | ||||
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| If a new contact is received, the phone | ||||
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| might | ||||
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486 | Busy Here | Yes | The Cisco SIP IP phone generates this | ||||||
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| response if the called party is off hook | ||||
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| and the call cannot be presented as a call | ||||
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| waiting call. Upon receiving this | ||||
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| response, the phone notifies the user and | ||||
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| generates a busy tone. | ||||
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487 | Request | See comments | This response is only received by the | ||||||
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| Canceled |
| phone in this release. | |||||
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| This response indicates that the initial | ||||
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| request is terminated with a BYE or | ||||
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| CANCEL request. | ||||
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488 | Not | Yes | The Cisco SIP IP phone receives and | ||||||
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| Acceptable |
| generates this response. | |||||
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| Cisco SIP IP Phone 7960 Administrator Guide |
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