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Open Issues #1: UAC is expected to differently react with a 493 (Undecipherable) error, depending on its sender. The error response doesn't include who the sender is. Options: A new error code for proxy, 496 Proxy Undecipherable The same error code, use the URI in the PKC appended to the response. #2: How does a proxy request to disclose a specific Content-Type or the whole body? In the current version, a proxy server responds with an error code and Warning header indicating which Content-Type is to be disclosed. i.e., “Warning: 380 proxy.com "Required to view ' application/sdp ‘” There is no way to request the disclosure of whole body. Proposal An error code without Warning header has the semantics of proxy’s requesting the disclosure of the whole body. |