Appendix A SIP Compliance with
SIP Header Fields
5xx Response—Server Failure Responses
5xx Response | Comments | ||
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500 Internal Server Error |
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501 | Not Implemented | For an incoming response, the Cisco SIP IP | |
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502 | Bad Gateway | phone sends a new request if an additional | |
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503 | Service Unavailable | ||
contact address is not present, the gateway | |||
504 | Gateway Timeout | initiates a graceful call disconnect. | |
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505 | Version Not Supported |
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6xx Response—Global Responses
6xx Response | Comments | ||
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600 | Busy Everywhere | The Cisco SIP IP phone does not generate | |
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603 | Decline | ||
these 6xx responses. For an incoming | |||
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604 | Does Not Exist Anywhere | response, the gateway initiates a graceful call | |
disconnect. | |||
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606 | Not Acceptable | ||
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SIP Header Fields
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| Header Field | Supported? |
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| Accept | Yes | ||
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| Yes | ||
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| Yes | ||
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| Allow | Yes | ||
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| Also | Yes | ||
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| Cisco SIP IP Phone 7960 Administrator Guide |
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