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6xx—Global Failure Responses
600 Busy Everywhere
All possible destinations are busy. Unlike the 486 response, this response indicates the destination knows there are no alternative destinations (such as a voicemail server) able to accept the call.
603 Decline
The destination does not wish to participate in the call, or cannot do so, and additionally, the destination knows there are no alternative destinations (such as a voicemail server) willing to accept the call.
604 Does Not Exist Anywhere
The server has authoritative information that the requested user does not exist anywhere.
606 Not Acceptable
The user's agent was contacted successfully but some aspects of the session description such as the requested media, bandwidth, or addressing style were not acceptable.
- 607 Unwanted
The called party did not want this call from the calling party. Future attempts from the calling party are likely to be similarly rejected.
- 608 Rejected
An intermediary machine or process rejected the call attempt. This contrasts with the 607 (Unwanted) SIP response code in which a human, the called party, rejected the call. The intermediary rejecting the call should include a Call-Info header with "purpose" value "jwscard", with the jCard with contact details. The calling party can use this jCard if they want to dispute the rejection.
Independent source: WikiPedia
Last updated: 01/01/2024
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