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 | CPE SIP Products | 
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 | 2.1.2.5.4 4xx Response – Client Failure Responses | 
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 | Table  | 
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 | 4xx Response | Supported | Comments | 
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 | 400 | 
 | Bad Request | Yes | The device doesn't generate this response. Upon receipt of | 
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 | this message, and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 401 | 
 | Unauthorized | Yes | Authentication support for Basic and Digest. Upon receiving | 
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 | this message, the device issues a new request according to | 
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 | the scheme received on this response. | 
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 | 402 | 
 | Payment | Yes | The device doesn't generate this response. Upon receipt of | 
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 | Required | 
 | this message, and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 403 | 
 | Forbidden | Yes | The device doesn't generate this response. Upon receipt of | 
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 | this message, and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 404 | 
 | Not Found | Yes | The device generates this response if it is unable to locate | 
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 | the callee. Upon receiving this response, the device notifies | 
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 | the User with a Reorder Tone. | 
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 | 405 | 
 | Method Not | Yes | The device doesn't generate this response. Upon receipt of | 
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 | Allowed | 
 | this message and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 406 | 
 | Not Acceptable | Yes | The device doesn't generate this response. Upon receipt of | 
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 | this message and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 407 | 
 | Proxy | Yes | Authentication support for Basic and Digest. Upon receiving | 
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 | Authentication | 
 | this message, the device issues a new request according to | 
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 | Required | 
 | the scheme received on this response. | 
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 | 408 | 
 | Request | Yes | The device generates this response if the  | 
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 | Timeout | 
 | expires. Upon receipt of this message and before a 200 OK | 
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 | has been received, the device responds with an ACK and | 
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 | disconnects the call. | 
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 | 409 | 
 | Conflict | Yes | The device doesn't generate this response. Upon receipt of | 
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 | this message and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 410 | 
 | Gone | Yes | The device doesn't generate this response. Upon receipt of | 
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 | this message and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 411 | 
 | Length | Yes | The device doesn't generate this response. Upon receipt of | 
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 | Required | 
 | this message and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 413 | 
 | Request Entity | Yes | The device doesn't generate this response. Upon receipt of | 
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 | Too Large | 
 | this message and before a 200 OK has been received, the | 
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 | device responds with an ACK and disconnects the call. | 
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 | 415 | 
 | Unsupported | Yes | If the device receives a 415 Unsupported Media response, it | 
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 | Media | 
 | notifies the User with a Reorder Tone. | 
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 | The device generates this response in case of SDP | 
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 | mismatch. | 
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 | SIP Release Notes | 
 | 124 | Document #:  | 
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